He is that kind of player. It's a bit exaggerated, but he will try to beat some opponents 10 times, lose the ball 9 times, all for the one successful move. This works in the Ajax team (although he still makes wrong decisions at times the team is under pressure and needs to keep the ball), because the team makes this creative role possible for him and when he makes a move other players already press in case he loses the ball. I don't think United is that team at the moment, and it could explain why he favoured Arsenal. Not sure if the PL is his kind of league, he might physically get run over.