The thing that i've noticed about Kinect games though is that they may not have spectacular launches but they just keep trucking along.
Here are some FW sales compared to lifetime for a a bunch of Kinect games.
Kinect Sports: FW = 305k, LTD (life Time to Date) = 3.27 Million
Body and Brain Connection: FW = 5k, LTD = 74k
Game Party in Motion: FW = 43k, LTD = 358k
EA Sports Active 2: FW = 15k, LTD = 278k
Dance Central: FW = 163k, LTD = 2.19 Million
Dance Masters: FW = 8k, LTD =81k
Your Shape: Fitness Evolved: FW = 73k, LTD = 924k
Kinect Joy Ride: FW = 63k, LTD = 882k
And here is one that opened up near to what this game did plus it also had horrible reviews.
Sonic Free Riders: FW = 38k, LTD = 507k
Mark my words this game will pass 250k and it will do it without breaking too much of a sweat.