Two of Kinect's biggest problems will be the depth map the IR sensor creates being 320x240 resolution, which takes subtle movements, fingers, foot/wrist-bending, etc, out of the question. It's framerate also runs at 30fps, which gives it an input latency of 33ms off the bat, excluding the extra time spent processing the imagery and applying bones to it, then having it work with regards to the game itself, so it's useless for anything requiring quick reflexes unless you want to start acting ahead of the action to ensure your movements are read in time.
I still want to try the thing though, hopin' my local EB Games gets a demo kiosk up for it eventually.
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