Kinect sucks for the most part. The microphone/voice command aspect of it is kind of cool for certain things. As far as games go... they never came up with anything good for the damned thing. Maybe they really really thought Kinect Sports Rivals would be an awesome showcase that got the casuals interested in parting with their $500. Now that its come out to zero hype and middling reviews they've finally given up.
It's so weird how committed they were to the concept without ever coming up with a true 'killer app' across two generations of the thing.