I saw this at the cast and crew screening last sunday (in a good cinema with a fantastic projector) and the 3d was STILL horrendous. It really did ruin any charm the film could have had (of which it has none I thought) and I hope this sudden grab for money by the studio backfires on warner brothers through word of mouth. I have already recommended everybody I know to watch this in 2D.
Furthermore from a CG perspective I thought many sequences were extremely poor such as the medusa sequence and even our own scorpioch battle. I'm not sure about medusa but with our studio the scorpioch's look has changed drastically since just before the first lot of trailers and it was definitely for the worst

. I dont know what WB were smoking.
EDIT: As you may have noticed above I said the scorpion battle would look great - I have to take that back now because after so much faffing about by execs not knowing what they want - the scorpions now look to me like they were ripped from a game from the GameCube. Avatar wins - full stop. Well done Cameron