I hated the performance yesterday, although loved the result. But it was sad to see after this much money spent seeing us resort to defensive tactics. We are still lacking in key areas. We need to upgrade on both of our Full backs. Most of the teams don't even have wingers now a days (Spurs/Madrid,Barca etc) they have fullbacks who act as wingers, but what they actually have is the ability to beat their man and put a cross it, which our fullbacks are unable to do consistently(Valencia, Darmian, Blind).
Secondly the 4th player mourinho wanted, an actual winger who can keep the width and take on their players from a standing position, i love Rashford but his biggest flaw is he can't beat players from a standing position, Martial is better than him at this, but we still need somebody on the right wing to be able to do this with Martial on the left.
Lastly, a number 10 who can run with the ball but is also able to keep possession and score goals. Yesterday was a perfect example of why i believe we need to upgrade on Miki and Mata, Miki although is able to run with the ball but he is very weak and can hardly keep the ball under pressure, while all other teams with number 10's use their body brilliantly, in fact Mata is far better than Miki in using his body and passing at the right moment, but where he lacks is he doesn't have the turn of pace Miki has where he can leave a man dead. There was a moment yesterday which summed up Mata for me, he received a poor back pass (in second half) in which he was against a defender and then through on goal, he tried to go past him but then his pace deserted him, so he went down and no foul was given.
One thing i will admit, even though i believe we have a brilliant Defence and midfield better than Liverpool and City, but they are just very good going forward with proper wingers in the likes of Sterling, Sane, Mane, Salah and perfect number 10's in De Bruyne, Silva, Coutinho etc.