Not my cup of tea, so I've steered well clear.
One thing I am interested in though, how much can this be recognised in the medium as a film and not just a visual spectacular utilising state of the art technology to promulgate an overly simplistic infantile message of ecology and the supposedly inherent wisdom of the "nobel savage"?
And if thats the case (I don't know I'll never watch Avatar, this is all surmising from the little I do know about it) is Silent Running a better film?
Oh, Attack of the Killer Tomatoes is a better film.
Well, ok, no it isn't, but sure, Silent Running is a far more cerebral thing.
Avatar's totally about the noble savage trope and a bunch of other hackneyed stuff, no argument. Doesn't prevent it from being worth a look. I was expecting to hate it, instead I had a good old time. It's spectacular, it's warm, it's likeable. Besides being as dumb as a bag of hammers.
Why not watch it and decide for yourself instead of judging from secondhand opinions? You might hate it far more than you expected, or the opposite, who knows.