Amrabat and Reguilón I'd add as part of the good batch.
Mount will prove himself before too long to the doubters (I like him already).
Casemiro is brilliant when his legs hold up.
Malacia, Onana, Antony are very underwhelming. Definitely got fleeced on Antony. Probably overpaid on Onana too, although he has to remember how to play keeper at some point.
Overall, Ten Hag's new players have been good and improved the team.
Martinez - 9/10
Eriksen - 8/10
Casemiro - 8/10
Antony - 5/10
Malacia - 3/10
Mount - 7/10
Onana - 5/10
Reguilón - 7/10
Amrabat - 7/10
My ratings would be more;
Martinez 8.5 - Last season a strong 9 during a long period and maybe the player that had most impact on the team with his attitude and fighting spirit, i remember when Dalot made a block and all 4 (Dalot, Martinez, Varane and Shaw) defenders got together and celebrated it like Gladiators fighting for their lives. That spirit made our defense even stronger and gave it a morale boost, hence why De Gea won the golden glove. Reminding me of Vidic. This season so far a solid 7 and injuries so it bring down the rating a bit.
Eriksen 6.5- Some matches last season he was a 8, maybe 8.5, but in to many games he does not show up and when his creativity and passing is not 100%, his physic makes him useless in the CDM/holding position and a player like McTominey is more valuable at those times. He is a player that at his prime would have been perfect for this team, also he is someone that everybody loves to like. Humble, no star attraction, seems like a good person, family man and remembering what happened to him at the Euros and just the fact that he made a fast comeback, carried Brentford where he had a great season and joined us for free does not make things worse.
Casemiro 8 - Had 2-3 great spels last season where he was the Casemiro from Real Madrids glory CL times, he was outstanding and totally owned the area between the defenders and the attacking midfielders. He won the ball, dictated the tempo, cowered grown, carried the ball, great passes going forward, even scored goals and assisted some. The 2 red cards that got him suspended 6 games was not good for us, and not was the fact that we did not have anyone to rotate with him so his energy dropped a lot last 2 months and that at his age now completely changes his performances, sometime we just had him on the field simple because of his status and leadership. This season, he has not been himself so far, but so has not many others either, so i hope that we can bring back the energy to the team because if we are already low on it this early in the season, then we are in big trouble. I also feel that he has not the stamina longer to play alone behind to more offensive CMs (like he did in Madrid with Kroos and Modric). He needs at least a ball carrying, deep sitting player next to him with a good physic (merge McTominey and Eriksen and we would have the perfect partner for him behind Bruno/Mount).
Antony 4 - If you made me look at all his matches for Manchester United, not knowing his price tag I would say the he is a fun player to watch when things work out for him and that i like his left foot and fighting spirit. Would probably guess he is a talent from our academy that we hope will develop to a good player (not near world class) and that we can give him 1-2-3 seasons to prove himself and keep developing and adapting to PL football. I would also say that he needs to work hard on his decision making, right foot so he can make faster passing in to the box, now that we have fast and strong number 9, when countering so we don´t give the opponent time to organize their defense, work on his dribblings and develop more effective moves and not ever again to the 360 "trick" with the ball.
BUT if you instead after watching all his games, told me that the manager that had him in his team last 2 seasons in Ajax did everything in his power his first summer transfer window to bring him to us, only one year after we paid a huge amount for Sancho to make that position his and the year before that brought 2 big talents in Pellistri and Amad (that we also paid a lot for) also playing at the same position, i would not understand what he saw in him that made him so convinced that he outplay all 3 of them big times (otherwise he would not ignore that we paid around 120m euro for Amad and Sancho).
AND IF you then told me that we had no other number 9 in the team besides a almost 38 years old Ronaldo, not had a CDM at place for a long period of the window (Casemiro came late), and still needed to add 3-4 players on top of that - i would be very surprised with ETHs decision.
BUT NOT THAT ONLY - if you for the end told me that we paid 100m euros for him, ignoring a player like Gakpo (who at the time had better stats then him) and at least would cost us half the price - i would honestly question the manager and asked myself why and what made him so sure he would be world class player directly that would take our offense to a new level for sure (you do not pay 100m if you don't believe that that player will have that impact on the team in zero time - or at least in a couple of months. And the end, he got some goals and assist, but i can not come up with one important game where he was the player carrying our offense and now add to that all the issues outside the field and for me its a big failure spending that amount on him. I hope something happens and he gets some kind of new start after this break and starts to show at least some signs of us not being forced to sell him for 10-15m euro to a Bundesliga team or at best for 40m euros to Saudi.
Malacia 4 - To be honest, we needed a back up for Shaw. Shaw has last 2 seasons made the LB position his and we did not bring in Malacia to really fight for the position but more to cover up if needed which was needed. My only question is (because we brought him to team as soon as ETH signed) how much believe ETH has in his future? He must be totally sure that he will develop to a much better player then what he currently is because at the time we had Shaw, Telles, B. Williams and one our biggest talents in the academy A. Fernandez already at place. Even though he was pretty cheap (15m euros?), we still needed all money we could get to fill all bigger gaps in the squad. Not sure what to say about his performances, he is pretty much what you expect from a player coming from Holland for that money - nothing special and i believe all mentioned players would be able to the same job. But because he is blocking Fernandez chances to play i would rather not have signed him.
Onana - 5 I was and still am a huge fan of David De Gea and would sign him NOW so they could both learn from each other, since they lack each others best qualities and we will have 60-70 games hopefully to play, split it on them, 30/30, Onana is also back in his national team so he will be away for some weeks and David does not have that issue. Now to some comments on what we have seen from him so far. I need to say that we lost more then what we gained so far with letting Onana in and David go. For us to benefit maximum or anything really from Onanas strengths, we need to start playing like a team. We need to have control of the ball, have some possession and stop letting the teams get so many open and easy shots on our goal. That starts from us pressing better higher up the field, midfield winning and keeping the ball and defense having control on opponents attackers. We knew that Onana was not the best ball stopper but he has let to many easy goals past him by. He should have saved at least 3-4 goals easily, and so far his passing not directly involved to anything more then our team really not know when to bring the defense line up 15-20 meter or when to drop and let him play libero. I really hope it will sort it self out when we have a stabile and consistent back 4, hopefully AWB-Varane-Martinez-Shaw and that they can get used to Onana and him to them and get to know each other and understand how we want to use Onanas passing. Someone needs to be the "captain" of the back four and decide when to go higher and let Onana pass long, when to drop and play out from the back four or when to drop a CM to carry the ball.
Mount - Not played enough for me to say much here, to early. Can not say that he has showed anything special yet but so has basically not anyone yet.
Reguilón - Have not played enough for a grade yet but so far so good. Like that he already shows commitment and he is for sure our second best choice on the left back. Far better then Malacia.
Amrabat - Can't put a here either. So far he has been what i expected from him, covering a lot of ground, fighting hard, playing with passion, carrying the ball. Can only see him get better, a lot, when he gets to play on his proffered position. I also really believe he will have the same passion and expressing it out loud and clear on the pitch playing for us like Bruno, Martinez etc. I believe that we need more players like that, that shows their commitment for the badge openly on pitch, kissing the patch, screaming out their feelings, firing up the supporters, giving each others a clap on the back or high fives. Bringing some american football "showtime" feelings. I know, from my life, that things like that can make you give the extra % you sometimes have in you without even knowing that. Höjlund is also a player with a lot of feelings and not afraid to show it.
Höjlund - No grade but he has showed more then what i expected. He has impressed me and my feeling is that he will be worth every penny and score 20+ goals in PL on a regular basis at least from season 3 and going forward. After the big money spent on a 20 years old players with so little experience, i can not see anything else that we need to build our attack around him and his abilities for the years to come. He has everything to become a world class number 9.