3D Does not fit
I have to agree about the 3D, although I have not played Sonic Generations I did buy Sonic Colours. Admittedly I did not research to well, I loved sonic as a kid better then the Mario games and when I started running the 3D sections it really turned me of, they are so crap.
Sonic should always remain a platformer in 2D or if they want 3D change it to something that works better.