Same basic flaws as 3D TV...
The VR people are missing the same boats the 3D TV people missed. Basically, our eyes and brains don't see the world like they present it. We've been looking at flat media with no depth all our lives and we're used to it so it doesn't seem strange. It IS strange though, and as soon as you move it into 3D the weirdness hits and we get headaches trying to resolve it.
We don't only align our eyes for depth info, things move in and out of FOCUS. Watch the foreground and the background goes a little fuzzy. 3D technology does not reproduce this (it would require serious eye-tracking to do it). The alignment angle does not match the depth-of-field data, and our brains don't know which is right.
Also, we don't see real-world motion as series of sharp-focus stills. If you watch a car go by, the background blurs with motion, or watch the street and the cars blur. Furthermore, the degree of blur indicates speed. VR images are always sharp, which destroys any sense of true motion.
With current tech, our brains get some cues that we're looking at a 3D world, but other cues are terribly wrong and our brains rebel. Until these two basic flaws are solved, VR or 3D of any kind is going to look weird and make people feel ill.
Biting the hand that feeds IT
