DDR Ex. 2 may feel too nostalgic, but its worth the fun (and it makes you sweat; a fun work-out!).
The Bads: Doesn't have enough unique qualities to make it significant to the series itself. Really, it could have expanded its limited multiplayer. Online-play isn't really that great of a feature.
There's not much else to say from this point. Well, to finish things up... DDR Ex. 2 is an overall fun and versitile game. If you hate exersise, then at least try the game... maybe you'll start to move a little at that point!