Of course the players have to take some responsibility in the way things are at the club, and quite frankly I think a lot of players in squad are Mid-to-Bottom league tier players that shouldn't be anywhere near our squad nevermind first team. However, the reason most of the buck stops with the manager is that, whilst it isn't the managers fault if say they miss an open goal or misplace a pass, it's the managers job to set an environment up for the players that gives them the best opportunity to succeed, by that I mean dealing with training, tactics, team selection, substitutions, identifying players they want, identifying who they want rid of, I could go on...
Now, you only have to look at specific players, playing under different managers, to realise the vast difference having specific managers can do for you.
Paul Pogba - Played great at Juventus and is a recent World Cup winner. Arguably has shown none of this form for United and has obviously fallen out with Mourinho.
Romelu Lukaku - Just seems like double the player at Everton than he has been here.
Marcus Rashford - Stormed onto the scene under LVG, now has just kinda regressed.
Anthony Martial - Same as Rashford really, has obviously fallen out of favour with Mourinho too.
Victor Lindelof - Excellent for Benfica, a proper ball playing CB, has been largely trash since getting here.
Alexis Sanchez - One of the worlds best at various clubs. Been absolutely garbage for us.
Fred - Early days obviously so can't really judge, i don't see anything special though personally.
That's just some, if i had to list players like Scott McTominay, Jesse Lingard, Phil Jones, Ashley Young etc well I don't blame them at all, why don't I blame them? Much like Moyes shouldn't of been put in the position to become the manager of Manchester United, some of these players should not be in the position to play for this club, the club see's fit to pay average players inflated salaries and our manager see's fit to continuously play them despite the fact they are obviously not good enough, how is that their fault, they aren't going to say no are they.
Jesse Lingard - Squad player at best
Scott McTominay - Not good enough, if he wasn't a homegrown we'd sell him and if he was on another team we wouldn't buy him.
Phil Jones - Might of been decent once upon a time but he's just a calamitous crock now.
Chris Smalling - Might of been decent once upon a time and shows glimpses still but he's just not that consistently good is he.
Ashley Young - Awful, can swing in a decent cross every now and again.
Marouane Fellaini - Slow, can swing an elbow, gets the odd good goal with his head, not worth it when the main tactic becomes lump it to Fellaini every damn time.
Matteo Darmian - Just awful, despite being much promise when he signed.
Nemanja Matic - Slow, pondering, just slows the play down far too much for me, Mark Noble had him in his pocket, it's like having a worse Schweinsteiger again.
Juan Mata - Hard to see what he offers these days, but he should not be on the damn wing.
Ander Herrera - Squad player at best these days, at least shows some actual fight and passion unlike half the squad.
Marcos Rojo - Not good enough.
I mean I could go on but, we made it so we can't get rid of half this crap because we pay them too much, half of them shouldn't of been brought in in the first place, we get bent over a barrel by Fellaini and hand him a new contract. It's just a shit show from top to bottom, but Mourinho's poisonous toxic atmosphere just makes it 10x worse, his system clearly doesn't get the best out of the players, he constantly slags them off, who the hell would want to play for a manager like this, he's just narcissistic, shallow, argumentative, toxic I could go on.
But one of the main things for me is, why the manager is a lot at fault, all clubs have players on their squads that are average, maybe we have more than others, but, Liverpool have average players on their squad, so do Chelsea, hell even City don't have a full squad of World Class players, but their managers get the absolute best out of them, that's also what Fergie was good at doing, the standards have dropped so low here that we don't even expect our managers to get the best out of their squads anymore, we always have to give the managers 5 years, 1 billion to spend and a full squad of their own players before we can judge them, despite the fact every manager in world football has to run with a squad of players from a previous manager and some make a total success of it, like Conte, like Sarri, like Emery, like Tuchel, like Klopp, like Pochettino... I could go on but it's getting tiresome at this point.