BP, I agree with you to an extent. I think Gonzo's level of play was not quite as high in the final, probably due to the occasion and due to mental difficulty in facing Federer. But I disagree when you say that Gonzalez played terribly - I think he played fairly well, all things considered. But he was not at the level of brilliance that he exhibited against Blake, Nadal, or Haas.
The other posters are right, though, that it is harder to do it against Federer in a technical sense. He simply covers the court better - not only getting to the ball but also hitting it back with depth and spin, allowing time to recover and retrieve the next one. Also, Gonzalez's slice backhand did not bother Federer the way it did other players; instead of setting him up with hittable forehands, it allowed Federer to control neutral rallies.
Also, Gonzalez couldn't do anything with Federer's second serve. Federer was hitting some good second serves, I grant that, but I think Gonzo could have done much better in that particular facet. I've seen guys like Blake be aggressive and punish Fed's second serve, and I've also seen Gonzalez do that to a lot of players. He was much too tentative in returning it, and thus Fed felt very little pressure in his own service games.
This match was much closer than it appeared. The rest of the tour needs to figure out why.
First of all - the James Blake/Andy Roddick/Andre Agassi approach to beating Federer has been shown, time and again, to simply not work very well. Federer has built his game to work very well with the predominant style of play on tour today. He's built his game to be very, very robust - and barring exceptionally good days from top-10 or top-20 level talents (Henman, Gasquet, Berdych, Safin, etc.) - odds are, your typical tennis isn't going to beat his typical tennis.
Trying to rush Federer with pace, either on serve or off the ground, is playing into his hands.
Similarly, plain old grinding rope-a-dope tennis in the mold of Chang/Hewitt won't cut it either. There's not enough threat there to worry Federer.
If you look at the data, Federer's closest matches in Oz were against Youzhny, Robredo, and Gonzo. We already know about his past problems with Nadal and Nalbandian. We can quibble about what we saw in this match, but what I saw was a guy who's so good that he's unaccustomed to two things:
1) extended points beyond his typical shot tolerance
2) close sets
We got some very un-Federer like errors in that first set, born of the fact that Gonzo wasn't going away, and from the length of rally. I wouldn't call baiting Fed with slice backhands a GOOD way to earn your points - but he did make a surprisingly large number of errors in otherwise neutral rallies. The problem is, do you have a) enough stick and enough fitness/mobility to keep things neutral? and b) enough of a weapon to make Federer think about staying away from it?
Even at the pro level, singles is about man-to-man - who makes whom more uncomfortable? Who's forcing the other guy to step up and play out of his comfort zone? Right now, Federer's combination of talent, training, and belief makes him a guy without a worry in the world. Yes, he's lethal, but he's also the beneficiary of lots of donations from guys fighting both themselves and Fed's reputation, as are all #1's.
Right now, there aren't enough guys out there whose games match up with Fed's in such a way to make it apparent to all of us in the peanut gallery that he's uncomfortable. That's not a lack of talent from the rest of the tour - that's a result of the dynamics in this particular moment in tennis history.
All that said, this final was pretty good as Federer matches go. Gonzo only lost serve twice to the man with the best percentages returning serve, if not the best looking return of serve. I'm personally disappointed that Gonzo shrank from the moment a bit in the first set tiebraker, but that's not too surprising. Here's hoping he's able to extend this particular success.