I'll go through the last few pages of user reviews when I have a bit more time, but so far my two cents is that Kinect is amazing. Kinect Adventures feels like more than just a pack in, I've played it and loved it, my wife has played it and loved it (she's not much of a gamer at all) my 4 year old son played it and loved it. Kinect Sports, Kinectimals, and Dance Central will be arriving soon.
The gesture controls on the dashboard blow my mind, the facial recognition hasn't failed me. Seriously, I was incredibly skeptical coming in, I work in the infrared tracking/entertainment business, the technology in this thing is dazzling.
I sound like a shill, so I'll throw in the statement that lag is pronounced, and the color camera's VGA resolution seems a bit weak, but my God...greatly exceeded my expectations. Glad I picked it up, and for $100 thanks to the CAG forum about $50 off on hardware a couple months back.
Oh, and I've felt like Kinect wants me closer to the TV than I'd really like to be, so the capture volume is a little small. I'd prefer to be 10 feet back, but all minor complaints.