Just finished the 360 version, getting every achivement (1000/1000). What a great game, my favorite Sonic game since S&K! If Sega has any brains in their heads, they'll make a sequel ASAP. I'd probably give this game a perfect score if not for.....
THAT FUCKING GOD AWFUL LAST BOSS!@#
Seriously, what a way to ruin a near perfect game. The controls are downright horrendus, you can't see debris until they smack you in the face, switching to classic Sonic is basically pointless, and the boost is wholely inconsistant. This is probably the worst final boss fight I've ever had to play, it's almost like it's from a different game considering how great the game is before the final boss.
Outside that terrible final boss, I loved this game. Easily my favorite modern Sonic game yet. Get to work on that sequel Sega!