They're bulky, heavy, hold heat, and you look like a dork wearing them. Maybe some sort of light plastic glasses like you wear for a 3D movie, if the technology was there to put an HD image in the lenses. But nothing in it's current state.
Even so, the experience of having a reasonable-resolution virtual world all around you is viscerally awesome. And when I use that word, I literally mean that it causes awe.
There are a lot of very smart people who seem to disagree with you.