You'll be fine Twig, its a 12A in the UK which means that even little kids under 12 can see it if there is an adult with them, so I doubt it will disturb you.
I very much enjoyed it, and if anyone is going to wait for the DVD, don't (unless you have a 3D TV...) because the 3D effects are stunning. This is the first film I have seen where I thought CGI has finally come of age, the hyper-real visuals are just perfect, and it there were only one or two little things I didn't find convincing (mostly to do with the physics of large objects moving- everyone who works in Hollywood special effects should do a engineering apprenticeship followed by a period as a demolition worker so they learn how large objects move in the real world).
I'm not sure its a Druidic film, modern Druidry all too often seems to be about our 'personal growth' or cultural heritage rather than our place in the community of all beings, but I did find it a deeply Animist movie. I was especially moved when Neytiri saves Jake from the attack by the pack of dog like animals, and then apologises to them, and attacks him for causing their unnecessary deaths by making himself a target unnecessarily. Now that's Animism!
Lithreal, its not just Native Americans who apologise to their dinner, its pretty much all primal peoples.
As for the plot, yes it is a familiar story arc, it would have made for a better and more meaningful film IMO if the Na'vi had lost the battle, after all that's what always happens on our planet, the reality would be that 100 battleships would turn up as soon as the price of space petrol dropped and blast the whole place to oblivion...
The symbolism, this drama of land grabbing corporate exploitation at the cost of tribal peoples is happening now all over our little planet, for uranium in the Kalahari, oil in Nigeria, oil in Siberia, cattle land in the Amazon, timber in Indonesia, palm oil in Malaysia etc etc etc.
And as for who the Marines represent, its you and me
. Every time we pull out our wallets and unthinkingly buy illegally grown palm oil or Nigerian gas or mahogany or rain forest beef or many many other things we put a bullet in a gun somewhere.
If this film has moved you please read this little book, which would be funny if it weren't true:http://www.survivalinternational.org/thereyougo
and check out Survival's website:http://www.survivalinternational.org