I heard the first two didn't work very well, but I thought by Just Dance 3 they got a better at the controls.
For contrast, here are some reviews from people that actually *like* Kinect. They rated Just Dance 3, Just Dance Kids 2 and Just Dance Disney all higher than Just Dance 4.
Here is a review of Just Dance 4: http://123kinect.com/kinect-reviews/just-dance-4/
And Dance Central: http://123kinect.com/kinect-reviews/dance-central-3/







