If it works it won't be a gimmick... the same way wii is not a gimmick. Next step to fully immersive gaming which is featured in so many science-fiction movies, novels etc.
Well, I wouldn't go as far as hatred but honestly... Yet another gimmick, probably followed by series of games adapting this as main way of controlling or at least incorporating it in some way.
C'mon, how many of us will want to stand in front of our tvs and throw shapes just to play a a game? Too much energy.
Let's face the truth - after playing Zelda for wii my only conclusion was - would be good with gc controller...