Bailly = Flop, but can turn it around.
Mkhitaryan = Flop.
Ibrahimovic = Great signing, even if it was only for the short-term.
Pogba = Great signing, though hopefully there's still more to come from him.
Matic = Good signing, but a pretty short-term one tbh.
Lukaku = Was so poor last season that he left United therefore he can only be considered a flop. At least we recouped most of the money for him (I think).
Lindelof = Good signing, hasn't quite been great yet but hopefully there's more to come from him.
Sanchez = Diabolical signing, worst signing United has ever made in their premier league era.
Fred = Has been great since the start of December, starting to look like a successful signing.
Dalot = Has been injured too much so far but has shown glimpses of unreal quality for a right back (going forward), wait and see for Dalot.
Grant = I don't even really count him as a signing tbh. Nothing more to say about him.
Overall, 2/4 success rate first summer (but one of the two successes is no longer at the club), 2/3 success rate second summer, Sanchez was a disaster of a signing, 1/2 in the final summer window (Dalot has unfortunately been injured a lot so far and I don't really count Grant, no disrespect to him).
Our signings under Jose had a 50% success rate. Not quite good enough tbh, you want at least 2/3 of them to work out, 80% of them.
Bailly = he had a fantastic first season with us then his injury prone problems took over his career. The guy had injury problems at his previous club as well. It makes you wonder why none at the club had picked that up
Mkhitaryan = I got some mates who support Dortmund and they all say the same about him. He's a decent players but he lacks the character to play at a top club. In fact he even struggled to settle down at Dortmund at first as well and they are a fable club to play for. Once again it makes you wonder why none at the club had picked that up
Ibra = Short term signing and a huge success
Pogba = Top top signing. However anyone who followed Juventus knew that Pogba can only play 1 position (ie left attacking side of a 3 men midfield). Both Allegri and Conte failed to change his role. It makes you wonder why none at the club had picked that up
Matic = he was already in decline at Chelsea.It makes you wonder why none of at the club had picked that up
Lukaku = he's a powerful goal poacher with the first touch of an elephant. He will score plenty of goals against small opposition but he would always struggle against top defenders. It makes you wonder why none at the club had picked that up
Lindelof = he's a decent defender but he's not particularly fast or particularly good in air. Which is a big problem in the fast paced EPL were crosses are still quite relevant. It makes you wonder why none at the club had picked that up
Sanchez = People at Arsenal knew that Sanchez was in decline. It makes you wonder why none at the club had picked that up
Fred = he came from Ukraine so he needed ample time to settle down in the EPL. It makes you wonder why none at the club had picked that up
Dalot = he came to United injured and has been injured ever since. Is he an injury prone player? It makes you wonder why none at the club had picked that up
Grant = irrelevant
Out of those players
Mkhitaryan, Ibra, Pogba and Lukaku are Mino's clients. Mou is quite close with Mino.
Matic, Lukaku and Ibra are Mou's ex players. We could have added Willian to that list. Thank god we didn't signed him.
Dalot and Lindelof came from the Portuguese league, a league Mou is quite close to.
That's not down to Mou as well. 1/2 of Moyes signings came from a club he had links to (ie Fellaini). During LVG period we've seen a huge amount of players coming from leagues he had close links to + players he had previously played for him and now things are looking that way with Ole as well (Haaland, Josh King, Ighalo, James who was suggested by his matey Giggsie, Longstaff who was suggested by his matey Carrick etc). I am pretty confident that if Pochs or any other manager is brought in then we'll see this same situation again.
Which makes you wonder, were they really signed for the club's best interests or was it down to their links with the manager?
So the issue here is pretty obvious. The system is inadequate to bring success. We need top football people at the club, whose got the club's best interest at heart and his job is to assess, suggest and facilitate the signings of players while stopping the managers from committing brain farts and giving jobs to his boys. TBF the managerial job had become far too big for the manager to also do the recruitment himself. He can't be expected to train the players while concurrently be in Spain to scout X player and negotiate with Y club and Z agent to try and signing this or that player. So seriously put this huge burden over the manager only for us to bash them for failing in it.
. Even though Wilder is doing great this season, his season can be described as an anomaly because he has not shown the consistency yet to do it over multiple seasons. Next season Sheffield could relegated, so I will wait until he has another season under his belt before he can even be mentioned in the same sentence as one of the top two managers in football. Pochettino side was in a transitional period, where poor performances were natural due to the amazing cycle that just ended where he took a team with nothing spent to top four and a champion league final. I can say that Wilder in his career will never accomplish that 
.