Yesterday I watched a TV show on German TV in which they used the Kinect system. It was broadcast on a major channel watched by millions. Two players had to play against each other in a quite unspectacular game. It was embarrassing, both due to the boring gameplay and the technical weaknesses of the system.
During the first game, suddenly the split-screen switched to a single screen such that only one player could see his avatar. Nobody knew why and the TV show host quickly reacted and said "well, now you had a training run".
After the second run one of the players complained that his moves were not recognized at all. He kept jumping all the time but the cameras obviously did not capture these jumps.