Listen I know this is gonna sound like sacrelege, and I'm very aware that it is, but well... The only sonic game I've played that I really particularly enjoyed was Sonic '06. Before I get killed, let me explain: I've tried the 2d Sonic games and just found that the gameplay style as a whole is really not for me. I was hoping there might have been a chance I'd be into mania, because before I played that I really wasn't into the originals on Genesis, but none of them ever really clicked with me. I played Sonic Unleashed, but the problem there is I played the PS2 version. When you got it at the time, I didn't have a PS3 nor did I know there was a version on PS3, or that the PS2 version was heavily stripped down. When I played '06 though, I played a significant portion of the game at a friend's house and largely went without experiencing glitches, so I just generally had a good time.