That's the thing though. I've seen quite a lot of United this season, mainly to laugh at their misfortune, and while he admittedly had some good plays offensively, his defending was horrible pretty much all the time. I know that Uniteds organisation this year didn't exactly let much room for a defender to shine, but his performances were still very, very weak.
Adapting to a new league at his age has proven to be rather problematic for other players as well in the past.