so ive only spent 1 session with this so far, but i was sore the next day. it works out different muscles than im used to working out. i usually just run, so doing a bit of cross-training feels good.
the games are actually..fun. the fitness part is as fun as working out can be. the main complaint ive seen is that you cant string workouts together, but if youre really pushing yourself at these exercises, you should take little breathers. it only takes a few seconds to call up the next routine anyway. the cardio has settings for length of time anyway, so it really shouldnt be that much of a problem.
honestly, all of the problems ive read about people having with this seem really nit-picky. i think its just easy to pick on nintendo. theyve never said that this is a replacement for your gym, or made promises about the game, because its still that at the end of the day, thats what it is, a game, its fun. more than anything, its just a good way to get in a quick workout without having to leave your living room, or just play a game and not sit on the couch, the draw of the wii in the first place.

to anyone who owns a wii: just get it.