Up until the centre mid part I'd agree, I however think you have to look at the team as a unit, and looking purely on paper ignores the contribution those players have to make to a style and the success of the rest of the team.
Whilst Schweinsteiger has reputation, Carrick has experience and skill, Fellaini has his elbows etc., I think our midfield is stronger because we have more variety, we have a better range of different attributes and can shape our whole team around that differentiation. I think United are one dimensional, and aren't stronger in the attributes in which we are already strong, that make us a better side. Sure, on previous Schweinsteiger and Carrick are better than Fernando, but he's not only a different player but has a different role in our side. If theirs were brought into our side they'd make it worse, if ours were put in theirs it would make it much better, no matter what Van Gaal tried to make them play.
So I'd disagree with you.