Dunno how he can be over rated, even most United fans have been pretty down on him the last couple years. Someone mentioned his fitness, its worth noting that this was the first time he's had a proper pre-season with United. As is quite obvious, fitness is a bit of an issue for him so I'm hoping a proper regimen and build up to the season will help him.
He's shown great ability at times to be a box to box midfielder, specifically there have been a couple of games against Arsenal (which gave rise to the song "he shits on Fabregas". We may have jumped the gun there
), the mentioned game at Anfield, a couple against Blackburn etc. But he's been unable to string these exemplary performances together thus far. I think he's improved a lot on that front in the last 8 months or so, could see him "doing a Nani" this year with the increased opportunities he'll get. At least he can last 90 mins now, that also used to be a problem for him.