This game is amazing! Don't let the name fool you into thinking it's a cake walk like the previos NSMB titles. There is a even a special challenge mode for the truely dedicated.
The only gripe I have is the music. THat infectious "Bah! Bah!" chorus from NSMB is back and it grates on my nerves. sadly there's no option to turn the music off other than muting your tv. But soundtrack aside the game is amazing. If you have fond memories of Mario 3 or Mario World than you owe it to yourself to at least try this game.