Saw it too in 3D the problem with the glasses is that it distracts you from to see the background good enough of the movie, so you can't follow the movie good enough, This was the first time a saw a movie in 3D and i can say you that i was really not impressed at all by it.
3D is nice for short attractions like Marvel park in Uiversal studios Orlando the 3D was cool there in Spiderman.
But a Cinema is not a an attraction park So i'll see no future in 3D for the Cinema's, i think it's only an hype for Now.
I also think that's it's really not good for your health especially your eyes to see an 3 hour movie in 3D, a couple of times during the movie i had to took my glasses off and eventually got headaches during the movie, a day after the movie i had massive pain attacks in my head.
So i see no future in 3D Cinema's so i'll boycot it.
No 3D panasonic plasma screen in my house to hell with it.
by the way Avatar is a bigboxoffice failure
http://boxofficemojo.com/movies/?id=avatar.htm