His sword was shortened, and it's much more difficult to pull off his tipper. If I recall correctly, his side-B can no longer be used to stall in the air while moving him horizontally -- or at least, it's not as effective. These, together with Brawl's physics and nearly nonexistent hit-stun, really make him a much weaker character than he was in Melee.

I do, however, like how he can zoom across the stage, in the air, with a fully-charged neutral B. That can be kinda fun to do.