Also the barfing. There's a possible solution to disconnected feeling in haptic feedback, but I'm not going to start paying attention to VR hype again until someone says "we fixed the whole horrible motion sickness thing, we are not going to make a significant chunk of our users loose their lunches."
http://www.gamesindustry.biz/articles/2015-03-05-gabe-zero-per-cent-of-people-get-motion-sick-from-vive-hmd I'm not believing it's solved, but maybe it could happen one day. Gabe Newell has told press that Valve has solved the problem of motion-sickness for VR users, proclaiming that "zero per cent of people get motion sick" when using the company's Vive headset.
There was an implicit "and not in an interview as part of the GDC hypefest" in there. I grew up reading Mondo 2000. I still have a Power Glove kludged to talk to a serial port and an HMD made out of a portable TV, Fresnel lens and swim goggles I made back in middle school. I would love for VR to be something other than a novelty. Gabe Newell saying the fixed one of the bigger persistent problems with a box of LEDs and a couple of lasers does not smell plausible to me.