I've seen people try to criticize the Avatar movies for supposedly engaging in the "noble savage" trope, but the Na'vi both aren't supposed to be any real world indigenous group, but a race of aliens from a different solar system, and are really so far removed from humanity they come across more as sci-fi Wood Elves* (or your local equivalent) from a fantasy setting. One can argue that elves are semi-divine beings in many depictions, because their concept comes from the myths of nature spirits, not aliens that evolved into being, however the Na'vi are the servants and favored children of a physical god. They're sentient beings and have clans, warrior-hunters etc. so they're not alien anprim hippies from a romanticized concept of Native American harmony n' peace.
Their home planet is explicitly different from Earth, whereas life on Earth is connected through our relationships to each other, life on Pandora is connected in this fashion but also by the biological ability to connect their nervous systems, and thus their thoughts and emotions directly. The culture of the Na'vi isn’t only similar to contemporary indigenous cultures, it is similar to how ALL human societies started out, even the one of you Europeans, before your people rejected the notion that life had value and nature is more than a tool to exploit. The Na'vi can’t lose their connection to their world the way humans did because of their ability to directly interface with it using those fiber-optic tails of theirs.
The film(s) borrow aesthetics from various indigenous groups, but they aren't a direct representation of any of them. Not even an idealized one. The closest is the teal water Na'vi adhering to the whole native Hawaiian "Aloha" pacifism thing, but that's where it ends. There was a deleted scene from the first movie that's obviously an alien version of an Ayahuasca trip.**
What's more, the whole "noble savage" thing usually promotes the idea that the main thing distinguishing the "noble savages" is their lifestyle and culture. If you or I were kidnapped as a child and raised in a noble savage tribe, we would be come like them with their manly virtues or closeness and respect for nature or whatever good qualities is being attributed to them that civilization supposedly lacks because of decadence, luxury, artifice, pollution and whatnot.***
The primary thing making the Na'vi the way they are is their biology. It doesn't matter how in-tune with nature a human is, they will never commune with Eywa, they will never bond with or ride any of Pandora's animals, and so on. This isn't the difference between "civilized man" and the "noble savage", this is human adventurers blundering into the sacred, enchanted forest of the elves, if said sacred, enchanted forest was the size of a planet.
Cameron has said that after Avatar came out he was contacted by leaders of various indigenous groups who felt the movie spoke to their struggles with neocolonialism, and he took that into consideration with the writing for the sequels. He also seems to think that the noble savage criticism of Avatar 1 at least has some merit because the third movie is supposed to include a group of navi who are assholes. 2 already moves away from that kind of characterization though because the plot involves the water tribe being somewhat blind to the effects the humans are having on the ocean and having taboos/superstitions that cause unnecessary conflict.
*Apparently the elves/na'vi idea is not new at all
https://james-camerons-avatar.fandom.com/wiki/User_blog:Avatarismyconstant18/Similarities_between_the_Na%27vi_in_Avatar_and_the_Elves_in_The_Lord_of_the_Rings!
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https://www.youtube.com/watch?v=Ud-0j4sU7Bs ***It's worth noting that the origin of this as a meme is the fact that it happened many times, with already grown adult settlers "going native" because they liked the indigenous society more. Also worth noting is that while there were lots of people who left European settler society for the indigenous peoples there were relatively very few who went the other way, including people who grew up in European cultures originally. This probably has less to do with the "nobility" of these indigenous cultures and more to do with the problems of European civilization and in particular the difficulty the settlers had in adapting to unfamiliar lands.