I want to try this, but my xbox just red ringed. (great timing).
I am as much of a sonic fan as the next guy, but I really have to question the fans at this point. While I would love some more genesis style games, they're not going to happen. I am not at all surprised that this game may not "feel" like older iterations. Hell, even ports of the original games didn't always feel right.
Is the game fun and worth the cash? If yes, then buy and enjoy. If it doesn't meet the standards of nostalgia goggles, go blow the dust off your genesis and get back to what you really wanted.