It's amazing how many people have walked out of Avatar. Sure it wasn't great but there are bazillions of worse movies out there. I dunno, maybe it's cool to walk out of popular big budget films or something. Give yourselves a pat on the back, truly you are superior to folks like me who enjoyed themselves.
If we're talking Avatar as in Last Airbender then that is more understandable. I mean wow, that movie stunk. Also, do Americans use "bender" in the same sense that us Brits do, because there was a lot of unintentional humour to be found in the characters referring to each other as benders with a straight face. There was no 3D in that film either, I'm glad I didn't pay for the ticket!
The only movie I ever walked out on was some rom-com with some mexican babysitter or...something. I was so glad when my friend said that she wanted to leave, I hate walking out on a movie if none of my friends are leaving. I don't even remember the name of the film, it left such a little impression on me.