On Wii Fit Plus, I liked the free step, free bike ride and the free walk were best for longer sustained cardio. The strength and yoga was fun, but that doesn't get my heart rate moving as much.
But I recently changed games from "Wii Fit Plus" to "Walk it Out."
I'm not sure about the game's burn so I wear a heart rate monitor when I do it so it tracks my burn more accurately. It's all low impact, obviously. I agree it isn't the same as other kinds of workouts but better than being on the couch!
Every bit helps -- esp with snow bound winter people or late nite folks who need something doable at HOME.
Earn a PALA with it!
A.