For those of you who own a Wii but don't yet have this game, all I can say is: Get it now! As almost every review on the web will attest the gameplay is top-notch, but to me the most impressive aspect was undeniably the music. The music manages to create a superbly matched mood for almost every setting in the game. I threw together a YouTube playlist consisting of some my favorite songs, roughly in order of preference.
For those curious, my death stats: Mario: 264, Luigi: 162