It was mostly because of the:
Nintendo games- Zelda as a launch title anyone?
Motion Controls- This was the entire hype for the wii, it was new, refreshing, people jumped all over it.
Wii Sports- This was the perfect game to show off motion controls, it was accessible and fun.
Wii Fit- How many mom haven't but a wii to try and get in shape?
Couldn't think of 10. :-/
Tag (Courtesy of Fkusumot) "If I'm posting in this thread then it's probally a spam thread."