He's going to be class lol, it's evident. You've got Kompany who's been making mistakes for a solid 3 seasons, Gary Cahill who has now actually been dropped because people are starting to realise he's bang average, and Koscielny who is probably the most error prone CB in the league whilst arguably being the best one as well. 3 first choice, experienced CBs for the best sides in the country this season, but god forbid if a Phil Jones makes a mistake at the age of 22 in the first season he's actually had a proper run at centre half.
Get some perspective, he's going to be class and he's most certainly United standard.