All the major gaming sites say the same things over and over again:
Input lag problems
Tracking problems causing games to loose sync with your movements
You need about 7 feet of distance from the device and another 3 foot or so around
Issues with lighting, clothing, and other environmental problems
Voice tracking only works half the time
Menu navigation is tedious and pointless and slower than just using a controller
No wonder Microsoft resorted to faking their two E3 demos of Kinect and refused to let the press have access to it before the thing went on sale. 500 million in advertising and PR isn't going to salvage this disaster of a console add-on.