I wanted to try this game because my best friend raves about it. I found the instruction great: step-by-step, and easy to follow. The music fun and made me want to move.
My problem is the faster the steps got, the more hopping and jumping around there was. I have bad knees (BOTH surgically repaired), so all the jumping around is NOT a good idea and I couldn't see a non-hopping alternative to all the steps. If it hadn't been for my physical restriction, I would've enjoyed it completely.
If you have the ability to do the dance moves without restriction, give the game a spin! If you have bad knees, skip it.