I actually have a couple EXERGAMES for mah Wii.
I wouldnt buy a Wii for these games, but they do make me sweat when the weather/timing keeps me from getting to the gym:
Golds Gym Cardio Workout— This is basically ‘Guitar Hero’ with jabs/upper-cuts/hooks/ducks/blocks/etc. It can get pretty damn hard, and is def an underrated EXERGAME for Wii. The controls are a bit frustrating at times (you do a move, it counts it as a ‘MISS!’), but the routines that are strictly punching are great. Music is crappy, but I just turn it down to the minimum to catch the beat and listen to a couple episodes of South Park. Also, you can usually find this one around on sale for $15. Definitely worth $15.
EA Sports Active— The resistance band means you can work bis/tris/shoulders at home. Tons of lunges/squats for your legs. And a ton of cardio. The guy trainer sounds annoyed all the time (he sounds like he has somewhere else to be. srsly.) , so I go with the obnoxiously chipper lady. This ones $40, but the leg strap really does keep you from ‘cheating’ :-/
IF you have a Wii, these games are totally better than workout DVDs, just because they are interactive, and there are dozens and dozens of routines on each.
If you dont have a Wii, Id have a hard time saying EXERGAMES are worth that $200 purchase…