I was frustrated with him(and the fan-base) in the first couple of season as I felt he had the ability to be the best CM in the world but was resisting maturing into the more well rounded midfielder we needed him to be, that far too many excuses were being made for him, too many instances of people saying he needs this, this and this, instead of him adapting to what Utd needed from him. The constant discussion of his is best role was irritating.
Looking back he has massively dropped from the level he was at in those initial years, and was probably never suited to what we expected or needed from him, Utd would be idiots to retain him, what is going to change?
Huge talent, very likeable personality in many ways but a disappointment on the pitch, if you have a great team, with a strong system that functions smoothly he will be a great luxury to add to that, give you match winning moments, but if you need him to be integral to that smooth function he is not the guy.