NintendoDpad:
"Wii MotionPlus is supposed to be 1:1 accurate, but with problems with recalibration, accurate soemtimes takes a backseat. The Wii MotionPlus actually gets confused if you do to much "waggle".
Wii Sports Resort tried to fix this with a recalibration button and screen, but in the end it still sometimes got a little wacky at times. Well, Red Steel 2 aims to fix the calibration problems of the MotionPlus for its game."