Might not be too bad. I enjoyed painkiller in 3d. Hard reset and shadow warrior were also very good.
It´s not the stereoscopic part, if that´s what you mean by "in 3d".
It´s about motion sickness, where what you see doesnt correspond to how your brain knows your head is moving.
I think it´s worse with alot of mouse twitching when you´re "in the world".. so to speak. (if your head movement is additive ontop of the mouse movement, which I assume would be the case since you dont want to rotate 360 degrees in your chair, for several reasons)
Watching a screen through sterescopic glasses still has a lot of fixed world points outside of the monitor edges, so your brain knows YOU´RE not moving.
With a VR set there are no fixed points, there is only the virtual world in view.
Going OP flashpoint might be a decent way to handle it, but that´s not great for twitch shooting anyway.
But essentially you move the crosshair freely within a deadzone, and when you go outside the deadzone, you start rotating the character.
That way your character is static when you aim around inside the deadzone, and the camera is only influenced by your head movement.
Well, I cant be sure, I only tried the DK1 with a controller in "walk around and take it easy" demos.
But in worst case scenario, those kinds of games might still be kinda awesome using a VR set for display only, not using the sensors?
Or it´s fine anyway, I dunno.