Motion-sensing technology doesn't always work out too good - I tried to play Mario Kart Wii once and even WITH the steering wheel attachment I couldn't control it one bit. As Mr. Stewart said, there's also the problem of your arms getting tired - motion tech works best when your entire body's involved, otherwise there's no improvement over using a controller(which can be kept in your lap). Something like this might make a great addon control, though - an FPS could let you raise your hands in surrender(Surrender Force Five, now on sale in France).