Apart from the fact he's a bit "handsy" I think he's a tremendous player. Reached this level he's at now, however, by leaving. It may have been reluctantly by both him and the club but you're deluded if you think his progression would've been the same if he'd stayed.
I mean, it's ridiculous to disregard him playing a full season in a team having a dream season who, not to be dismissed either, play an entirely different way to us. No way would he be where he's at now if he hadn't gone AND to Forest, for that matter.