Personally, I like Sonic's Brawl up-smash, appearance-wise. I'm glad it didn't become the flip-kick, since that is a little overused for up-smashes. I also like what the original down-smash looked like, as well, but I'm fine with the new animation.
I guess I'm just in the minority on preferences with Sonic's spin animations.
Anyway, since we're on the subject of Sonic and animations, I've noticed something a while ago but keep forgetting to say something about it: how come forward momentum during taunt causes a cancel with the teeter animation, but backward momentum during taunts don't cause a cancel by sliding off? When you move backwards (via moon-walking) and taunt while approaching the edge, you simply just stop right at the end, instead of sliding off like you would if you weren't taunting.
It's nothing important, but if taunt canceling is in, might as well make it work for backwards momentum, as well. Imagine moon-walking to ledge-hog your opponent, all while taunt-canceling "You're too slow!" as you slide off and take the ledge right before they get there. The best result comes with Sonic, but others can do it, too, and cause almost as much irritation from the opponent... XD
And FC Hype! Can't wait to see how the P:M tournament unfolds.