Simplistic. But involved if you want that. Superb!
Sonic Generations is pretty fun its like a combination of Sonic Advance and Sonic Adventure without all the extra playable characters. It's fun to try and get the highest ranking on every level (S ranking). I'm sure I'll have fun later trying to get all the 5 red rings in every level. Stage 1 levels are really nostalgically rewarding and Stage 2 levels are a nice modernized sort of challenge.
For this game to be the OFFICIAL sequel to the 1982 classic, it falls WAY short of accomplishing that. Almost everything about the game feels dated or unfinished. Bad graphics, choppy animation, weak story and some of the worst A.I I have EVER witnessed. Just a complete wreck of a game. If you just want to feel like being in the Alien universe get the game. If you want to feel that way and actually enjoy your time and hard earned money just avoid it!! It pains me to say it I spent $100 on the collectors edition. :-(