I just played it for a few hours straight. This game is the best of the series, end of story. Holy SHIT it's awesome. I love doing the combos like Prophecy said. I think I got up in the twenties with pure Uber Tricks on one of the Half-Pipe levels. My thumbs hurt.

My only gripe is that when you buy items for your character (clothes, accessories) there's no way to tell if it's going to benefit or not benefit your stats. I bought the pumpkin head for Mac and it lowers his stats considerably. The motherfucker cost $25,000 too! Oh well.
I love the new hand-springs that you can do on rails. That's badass! Makes it easy to link combos as well.
-Lasereth