Of course the glasses are uncomfortable, but I'm talking about the 3D itself. It's simply not comfortable to view, especially in shooters and other games where the action takes place at 200 miles per hour.
All you have to do is go online to find countless testimonials from people who experience nausea, headaches, eye strain, and more when viewing 3D on their televisions. Some people can't see the 3D effect at all, and for them the screen just looks blurry and out of focus. That doesn't sound like technology that will ever fully catch on.