I've Played Quake And Q2 In VR
The speed is disorientating - once you take off the Occulus.
I adapted to it ok, playing with a hydra: http://www.razerzone.com/gaming-controllers/razer-hydra-portal-2-bundle
Played the classic Light for Q2 (Lazarus mod) and run around warp spasm with a modded Quakespasm port.
notice the change in speed with real world movement. I got a bit of vertigo after unplugging.
Neither really used the potential of the system that much. A better one I played was a HL2 mod, where the actions for fighting had to be done with the hands. So, reloading the magnum you had to bring your right hand up and tilt it to bang out the spent cartridges.
To look down the scope of the crossbow you had to hold your hands up to shoulder height in the correct posture.
I don't think a Quake game would translate well to the flexibility of VR.
One of the most impressive I played was this: https://www.youtube.com/watch?v=5Y5ADiz7Iio
That's an older version apparently - the one I played had two hands (grapples) and larger environments. Still not graphically amazing and without any real goal, but it gives you an idea of the scope of things.
Needless to say, but the immersion is incredible :)