He has certainly been a game changer for United, his stupid foul against Idrissa Gueye handed Everton a point for no reason at all. His needless back pass in the Community Shield allowed Vardy to score. He lost Robert Pereyra who set up Watford's second goal.
Perhaps you think he is a typical United central midfielder? I prefer the likes of Scholes, Ince, Keane, Whiteside, Robson, McIlroy, Moses and going back even further Crerand, Charlton, Colman & the incomparable Duncan Edwards. He doesn't fit in well in that list, does he? Of course, YMMV.
A full head of hair? I have one of those too but choose not to style/dye it to look like a member of a Sweet tribute band.