I wear glasses to be able to see, so the idea of putting glasses over my glasses kinda sucks.
Also, I have a strange hatred of the 3D craze, some films are made for 3d sure, Avatar for one (which was a pile of dog poo btw) others just seem to have 3d effects tossed in for no reason. If Cameron is remaking Aliens in 3D thats whats going to happen, a great film, ruined by gimicky effects.