I think all kinect games are selling really well, kinect Sports looks like it will sell a lot it should do 1 million next week. Dance central, Kinectimals, and maybe even your shape evolve should all be million sellers or even more. It's not suprising games like Joyride and Sonice free riders are not selling as much because they had horrible reviews compare to the other games and the other games are getting advertising specifically made for them like Kinect sports and Dance central. I have yet to see an ad for joy ride that is specifically made for it.
Anyways all games are selling quite well actually the majority of Kinect games are over 100,000 the only ones that aren't are the biggest loser game, Dance masters and adrenalin misfits both from Konami, and deca sports freedom I'm only counting games that are specifically made only for Kinect and not other platforms and all Kinect games if you notice their sales charts seem to have really great legs.
I think most Kinect are going to be million sellers in the long run seems like they will sell similar to wii games as in they sell little by little every month and when you least expect it they have already sold more than 5 million.