Another fun thing, the drums in Rock Band is actually decent training for real drums
I have to disagree here. I've been playing the drums for 15 years and I just can't play drums in Rock Band. Drums have a very improvised and intuitive nature in the way that you don't necessarily have to play the thing exactly the same way every time, especially in rock and jazz music. The kick in Rock Band is pretty much randomly placed which makes it very difficult for a real drummer to follow the visual cues of the song. Basically, I have a tendencie to try and play the real thing when the game does everything but...
The guitars on the other hand, I find are very fun to play, even if I do play some real guitar in life. Of course it is nothing like the real thing but the picking patterns make it "feel" more realistic and "musical".