But the Wii rarely uses IR outside of menus with most games... most of the time it's all motion controls... and why do you call it IR motion?  They're two different techs that are built into the remote, one being IR and the other being the gyroscopes of which the Wii remote has far better ones built in then the Sixaxis, which I thought was going to be updated when DS3 came out <_< the Gyro technology is fairly cheap now I don't see the huge issue really... though I have seen that PS3 motion controller which is basically WM+ so maybe holding out till that comes out so they can market it as a huge improvement over Sixaxis.

mirrors edge has it a bit when balancing.

Motion Sensing is a nice addition, but I don't think a game should be built around it. It's just nice to break all of the button pressing up with some nice tilt. It's generally best in minigames and such, very rarely does it work well in main gameplay, Folklore is one of these rare games. Third Parties don't use it because that would make the PS3 version different, and they can't be bothered, first parties... well, LBP has motion sensing, Uncharted has motion sensing, I haven't seen motion sensing in R2, and ToD has motion sensing. So three of my four first party PS3 games have it.