Voice commands have gotten a reputation for being cool but not practically usable. Not only is there a lot you still can't do with it, often things you're supposed to be able to do just doesn't work. I think going to the sonar station is one example - it just stopped working after a while.
FWIW, it's a similar deal with 3d glasses like
edimensional's or the
z800 from 3dvisor.com - most games "show their true nature" when such are used. Oblivion's trees, for example, appear flat, at the "depth" of the nearest leaf. "Trackmania nations" has cars in 3d, but those cars are otherwise placed on a flat screen. Plenty of similar cases.