Saw Avatar. My verdict:
It is 'Dances With Wolves' on an alien planet.
With brain transfers thrown in for fun.
Yup, the 3D and special effects were cool. But go to the late show so there will be fewer kids. Its PG-13, yet because of the toy tie-ins, and the colorful ads parents think its okay for tots... that is until the military action begins.
One poor kid (~4 yrs old) literally -ran- out of the theatre we were in. So, if you wouldn't bring your kid to 'Dances With Wolves', don't bring him/her to this. *If you need any further persuasion... the 6 previews made the entire show nearly 3 hours long.
Fun Fact: many sfx came via Weta of New Zealand