I bought a Wii for myself several months after it came out. I regret the decision. I never play it, and I gave it plenty of chances. I own a total of three games "The Legend of Zelda: Twilight Princess", "Super Mario Galaxy" and "Super Paper Mario". The only one of the three that held my interest was Paper Mario, but how many times can I play through that?
Maybe it's the low-def graphics, or the motion controls that frustrate me (I'm too old-school to now waggle my arms at the screen just to play a game), but Wii games don't excite me. I play the heck out of my Xbox 360 and DS Lite, so I know it's not the current generation of games. I really liked my GameCube too, so I know it's not Nintendo's console game lineup.
Don't mean to rant, but I don't ever recall regretting a video game system before. Well, maybe the Atari Lynx, but that's in retrospect. I liked it plenty when I was younger.