It was entertaining (required) and had great special effects (bonus feature). As a morality play, I thought it hilarious with the "workers of the world, unite(!)" ending. Here are peaceful, benign, at-one-with-nature, ideal (nobody has a job) natives. As with all such themes, I wondered why these perfected beings always have lethal weapons with them.
It was also puzzling that Unobtainium (catchy name) was found only in one place on the entire planet, Pandora (another catchy reference), viz., under the Big Tree the Ni'va lived in. If the evil earthlings couldn't go there without getting whacked, how did they know it was there? With the technology the evil capitalist earthlings had, why didn't they bargain for it, since the natives had, apparently, no use for it? The evil earthlings could have figured a way to get the stuff without damaging the Big Tree. But, as is the case, the evil ones had to be portrayed as stupid, brutish, clumsy, ignorant, etc.
Wondered the same thing about Star Trek. The premise there was a perfected social order where there was no crime (supposedly), no need for money, no evil capitalism. Everybody acted in lock-step socialist altruism. Except for the folks who inhabited the biggest, baddest, most-powerful, space-born weapons system imaginable. And then there was the constant theme that they were "peaceful explorers." That's ok by me. But wait! Now, the liberals are telling me that Columbus and Coronado were "bad guys?"
The intrinsic inconsistencies of such themes give one an appreciation for the word "irony."