This is definitely a bad game, I'm watching a let's play of it (Cobanermani456, a huge Sonic fanboy) and even he hates it. It has PS2 graphics, lot's of glitches and bugs, uninteresting story, extremely repetitive combat system, mediocre platforming, etc.
In Cobi's latest vid of this game he shows you a part of the game how it looked in Alpha mode and how it looks now. What a BIG difference, it looked a lot better when it was first shown off.
Anyway, Sonic is and has always been a mediocre franchise. I've seen people call Adventure 1 & 2 the best 3D Sonic games and those games are complete trash. Never played any 3D Sonic games, but watched some let's plays of it and lot's of reviews. Especially the ones from SomecallmeJohnny are very in-depth, check them out if you have the time (I think they're 40 minutes long).
