Mate some people on here know more about football than Jose Mourinho and Van Gaal so maybe we should believe them when they say ‘he’s rubbish’ with no evidence whatsoever.
People are allowed their opinions but yeh, it'd be good to support them with a bit more reasoning.
He can be reckless, he can be over-zealous and yes, he does make mistakes.
However, he is quick (at least quick enough to play in a high line), decent on the ball and good in the air. He's also strong and physically imposing.
The main issue for me would be price/wages. I wouldn't want to be paying him too close to the 100k p/wk he's (at least) on at United, while I don't think - due to the series of bad injuries he's had as much as anything, and his age - we should be paying over £15m (at least up front anyway).