United weren't any better last season. Some dodgy refereeing decisions against tough opponents (Liverpool red card, Hernandez offside goal against Chelsea etc.) + RvP bailing them out was the story of their season. I still remember how Southampton were completely outplaying them at Old Trafford and how SAF parked the bus against Spurs. Overall Cleverley, Young, Welbeck, Nani etc. didn't perform much better than they are doing now. Bunch of average players + the firepower of Rooney and RvP upfront is enough to win a league title. You transfer Rooney and RvP to Spurs and they'll easily walk the league as well.