Just played it for the PS3 today. Sadly, I am disappointed.
As Fafnir said, Sonic feels heavy. He is considerably slower than in the past, and that is a serious letdown. In fact, there seem to be way too many obstacles
intended to slow him down. Sonic has absolutely no momentum, so he stops immediately if you don't hold down the directional pad/analog stick. Game mechanics need much improvement. The homing attack (though not as unbearable as in Sonic Heroes and the like) is still poor and often misses its target. Also, the designers have no creativity; all the enemies and bosses are identical to previous games, except with the bosses having that "desperation mode."
I do like the art/graphics. The developers spent a lot of time with that (perhaps too much, judging by their other mishaps). Music is enjoyable too, and nostalgia galore with the sound effects! If anything, the end is worth all the fighting and complaints. I won't spoil it, but if you really like Sonic 2 and a challenge, then you'll love this.
I haven't collected all seven Chaos Emeralds though. Anyone know if Super Sonic is unlockable?
Lost Labyrinth Act 2 has a retarded puzzle where you have to stop and figure out which torches to light in order to pass through. The controls make it even more awkward.
Ditto to that.