They have some habit of wrecking promising attacking players. Di Maria and Falcao were nightmares. There's still a decent player in Depay now, back then he had a chance at super stardom...I have no clue what they did to the poor sod.
Mkhitaryan looks like he's doped with sleeping pills half the time, another player simply ruined by the team he's in. Kagawa was the same.
Mata went from being Chelsea's best player for two seasons to pottering around at United showing glimpses of real class in the midst of a whole lot of mediocrity.
They'd like to make you believe Pogba was a bargain but he has largely been anonymous, but putting in a good performance against Stoke and making 5 yard passes for assists seems to be credible for a world record transfer fee it seems. Of course United fans would have seen about 5 games from Pogba before he joined, but he's a shadow of the player at Juve. Granted going from Pirlo and Vidal to rat face Herrera and the Tree is a big change.
Lukaku is a coin flip whether he proves worthwhile or not. At times he looks unreal but then he does sweet nothing for a few games in a row.
Martial looks decent every now and again but seems to have peaked already. Van Persie seems the real exception, he was lethal. Then again he was lethal for Arsenal before he moved too. Zlatan put in a handy shift as well to be fair.
There is something seriously wrong with them. Sanchez has the ability to do it all by himself but I wouldn't be surprised if he wants out by this time next year.