I believe it will take some time until the VR finds it's own legs and starts making games that truly benefit from the experience. Until then, I think the best use someone like me would get out of it is playing flight and driving sims. I haven't tried it yet, but I'm very keen on the immersion that these might provide.
Shooters have been the go to genre for obvious reasons, but I'm keen to see adventure games really start to pick up. The other issue is the space that people are ready to dedicate, this will also keep it as a niche technology. Horror is great too, also obvious. But you can't have things that would take way too long, such as grindy RPG's, because wearing it for extended periods could cause crazy discomfort (not just sickness, but eye strain, etc.)
I was also thinking RTS games, or some kind of multi-interface games would work well in a minority-reportish kinda way, but to people who are used to keyboard shortcutting and clicking around a map with fluidity, it could just be frustrating with a new, sluggish input. That's how I felt the first time I tried a FPS (NOT on-rails shooter) using the PS3 Move controller gun. Very different to say, RE4 on Wii, which I think pulled it off rather well but that's not exactly an FPS now.