I've played M&S, and I think it deserves it. Gameplay is fun, and there's a lot of variation. Many testers complained about the controls being too complicated - I actually think it's a good thing they're not too shallow.
It's a bit lacking in overall presentation, though. You can tell from the graphics, animations, menus and music that this is not an in-house Nintendo game.
Currently playing: NSMB (Wii)