To be honest I didn't know much about the plot before the movie, just knew that there was going to be some blue people in a really crazy new world. That's how I would like you to see it, without really much knowledge before hand. I loved seeing it that way because then I wasn't expecting much or anticipating anything.
Two great and upcoming actors are Sam Worthington(Jake Sully) and Zoe Saldana(Neytiri). I love Worthington in the latest Terminator movie, his buzz head and military like acting came out again in Avatar. Zoe Saldana's voice as Neytiri was absolutely perfect. Neytiri held a goddess like aura and Saldana nailed it.
There are two side notes I feel that I should make:
1. I saw this in 2D and am hoping to see it again in 3D, when I do I will let you know the difference.
2. There is a hint of a political agenda in the plot of this film.
Honestly, one of the best movies I've seen in a while. Don't wait to see this, because everyone will be talking about it.