i've already agreed that wii boxing is utterly terrible, but this is why.
boxing is the hardest of the 5 to implement well. simply trying to recognize a set of gestures would not be good enough, since different individuals have different physical tendencies. the game would need to have a learning engine for motion recognition, or simpler just some calibration to your movements before you actually play the game. i.e. instead of you figuring out the gestures, the machine figures out your tendencies.
it shouldn't be too difficult to implement. takes a little bit of research but it's a well-researched topic and good developers should be able to do it no problem. but you do need a little bit of effort. you can now understand why wii boxing is so terrible--the other games have gestures that are very clear cut, and nintendo didn't bother putting in something even a little bit more sophisticated for boxing.
maybe EA will do it. they have so many sports games that they probably should develop an engine for motion recognition anyway.
the Wii is an epidemic.
