Excerpt from another Kinect (released today) review
The Wii, by tracking the position of its remote control, was amazing for its time (2006). It’s a natural for games in which you swing one hand — bowling, tennis, golf. But the Kinect blows open a whole universe of new, whole-body simulations — volleyball, obstacle courses, dancing, flying.
It doesn’t merely recognize that someone is there; it recognizes your face and body. In some games, you can jump in to take a buddy’s place; the game instantly notices the change and signs you in under your own name. If you leave the room, it pauses the game automatically.
There’s a crazy, magical, omigosh rush the first time you try the Kinect. It’s an experience you’ve never had before.