I recently saw both Avatar and A Christmas Carol in 3D (the first in IMAX as well) and I have formed the view that it is being used as an excuse to squeeze more money out of us. Apparently Avatar is now the biggest-grossing movie of all time. In just one month! That couldn't possibly have anything to do with the ticket prices at the 3D/IMAX screenings, could it?
From a creative point of view, I don't object to it. There were moments in both films that would have looked much less impressive in 2D - but there were plenty more where it made next to no difference at all. One thing I did notice, however, was that the polarising lenses used in the glasses are dark grey in colour and they dim the image that you see quite considerably. You get used to it, of course, and the movie compensates by making the unfiltered image overly bright, but even so they can be tiring to wear and I don't look forward to having to don a pair whenever I go to the cinema. Even less do I look forward to 3D television. Imagine having your viewing ruined because the dog ate the specs!