When he was in Italy, he was a bit of a golden boy.
Since he's been here, he's endured nothing but criticism almost all the time. By the media, by fans(directly), by former players and from his own manager in Mourinho. Some even claimed he faked his injury. There was even criticism for attending his brother's fecking wedding.
Mentally, that must be very difficult to see that someone has always got something negative to say about you, on a constant basis.
Granted, many came to his defense but it has been rather irregular.
In this regard, I think fans failed Paul Pogba as a Manchester United player. Everyone jumped on the media bandwagon and have been on it ever since.
Not that he's without criticism but not to the levels he's endured ffs. And throughout he's stood and faced it.
While he's had an inconsistent time here, his position honestly has not been helped at all.