In developing Grand Slam Tennis for Wii, producer Thomas Singleton has noted that MotionPlus is a little too reliable.
The plastic plug-in has been designed to enhance the precision and sensitivity of regular remotes, but it seems like it might be a little too accurate for those working with it. Fortunately EA have been working hard to get the balance right, limiting the sensitivity levels for "total control".
Thomas Singleton, Producer of EA's Grand Slam Tennis on the Wii
Thanks to Tech Radar.