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But I'd have to agree with you on the 2D thing - completing a level in about 20 seconds due to the perfect design and blistering speed was fantastic.
That said, I've not played Sonic Heroes yet. I heard it was a bit stop / start and not fluid like the good ol' 2D ones.
But Sonic's Sonic. Everything he touches turns to gold.
Except Sonic 3D, of course. That was utter shitewash.