XBOX360 is a great system for certain games. FPS, Xbox live.
Wii is fun in it's own way and a great console... interactive, and an over all great party console.
All I'm saying is that it's hard to compare two different style consoles like the Wii and 360. That's why the best of both world is having both.
You can't tell me you wouldn't like to have a Wii AND an XBOX360. That's just pure insanity.