Federer's victims within his 12 slams have all been mental has beens that he has owned. There were only two who could keep up with him, Nadal and Agassi. Nadal unfortunately didn't convert on the 3-4 chances he had in that 5th set, and Agassi was old and ran out of steam after the 3rd set tie breaker. Other then those two, you have had guys like Gonzalez, Roddick, Baghdatis, Safin, Hewitt, and Djokovic, all who choked big time in those finals.
Really, you would bet Federer to beat Nadal at the USO at this point? The same Federer that got destroyed by Mardy Fish and beat by a subpar Andy Roddick on HCs? I highly doubt that.
Yea, and to Fed's credit, to begin with, Nadal had his # on HC too, quite often. But lately, Fed's dominated their HC's. So how is that mentally weak? Sounds like overcoming adversity to me.
And look, a lot of other players, against Nadal, just would have gave up. They wouldn't be making it to clay-court finals. They wouldn't have the mental fortitude to "forget about" completely blowing the 1st set, and almost doing the same thing in the 2nd set, to win the tie-breaker.
As for Federer vs. Nadal at Wimbledon, imo, they have slowed down Wimbledon a lot. It's disgusting. It really should be a skidding, fast, low-bouncing surface. But it isn't what it was. It is more favorable to clay-courters. That said, I still think Nadal would have made the final, even with 1980's grass. I think Nadal's about as good a grass-courter as Bjorn Borg; that is, 2nd tier, all time...behind Federer, Sampras, Gonzales, Laver, McEnroe and a few others. But I just don't think he would have been as competitive with Fed on faster lower-bouncing grass.
None-the-less, even playing out of his mind on grass at the final -- it was clearly his best match of the tourney by far -- he still lost. And don't give me that, "it's because of injury" crap. Federer played some extremely clutch tennis to reverse things.