The only thing motion gaming is good for is dancing. There it has a real 1:1 mapping with the actual activity it's trying to mimic. There is no other action that we humans perform where the point is to move our hands and touch nothing. Every movement we make is to either touch or avoid another object. Trying to simulate any action where we'd touch something, by instead having us touch air is counter to any sort of immersion.
I'll agree that not actually touching something makes it weird. That's why I'd still like to see genre-specific input devices that the Kinect is simply supporting. Of course, this fragments the audience, too.
