The game truly is the best available for music lovers, far beyond what the other music games on the market can offer. Now that I finally managed to get Wii Fit as well a few weeks back, I've been able to start using the full drum mode, and that frees up what you can do in your videos and arrangements so much more.
Be aware that it's difficult to get the hang of the drumming in the game, but certainly not impossible; there are some useful introductory lessons that walk you pretty far into the basic patterns and uses for the hi-hat, snare, both pedals, toms during fills, etc, but after that point, it leaves it to you to figure out how to create your own drum parts, with the whole set sitting out in front of you just as if you were sitting before a band with a real drum set. In other words, not at all like the drums in Rock Band etc, where you don't even have to know the first thing about the components of a drum set or how to create an interesting beat that works well with a particular song.
Also, I believe this link has been posted before, but for those who haven't seen it, here are Nintendo's staff clips, some of which are very clever:
http://us.wii.com/iwata_asks/wii_music/staffclips.jsp







