Gameplay is not particularly exciting. Seems like a clusterfuck effort yet again to appeal to nostalgia.
Level design has the potential to be interesting, but Green Hill version 1,000,000 was somewhat boring.
Villain designs are unbelievably atrocious and make me want to throw up.
Aesthetics are decent, although the graphical quality is worse than in Generations.
So, yeah. I'm not one to buy into a system for any one great game either, never mind one that looks mediocre. I'll of course wait on more gameplay and information to make my final judgment, but I'm not particularly optimistic at this point.