This is a pretty good game, however it is by far not the best game of all time. The story, like most Mario games, is lacking. The game play is alot of fun though. Even graphics wise for a Wii game it is pretty impressive. This is probably one of the few Wii games I have played that didn't feel like a ported PS2 game.
Needless to say though if you enjoyed other 3D Mario games you will probably love this game. Alot better then Mario Sunshine, and just as good as Mario 64.