Wii Fit (Wii, 2008)

Although there is some major hype involving the Wii Fit and it is a pretty decent "game" for $90+tax, I wouldn't call it revolutionary or extraordinary. I bought mine about two weeks ago and I have enjoyed it. I especially like how it weighs me and logs it on a nice chart along with my BMI and Center of Balance (COB). I could care less about the BMI because we all know it's in itself is a pretty poor assessment for one's body.
I have to be honest though, I have been getting a little bored with the Wii Fit games. For the first week they were VERY fun, however, after a while it gets a little stale. Maybe because I already run/bike/lift on my own and it doesn't really offer me the challenge I was looking for. However, yoga and balance games are still fun. All in all, it's a good start in fitness games and Nintendo has done a great job with it. I have been getting a little more flexible thanks to yoga and I am more aware of my balance. Whether you lose/gain weight on it is up to you, how much you exercise, how you eat, how hard you try.
I hope this helps.