--SPOILER ALERT---
I think the plot was more interesting than people give it credit for. After all, this wasn't about a nature-loving native people who represent some ideal--that's actually a misconception that the money-grubbing aliens fell prey to.
It's not about nature worship or religion, they're actually part of something that the humans don't have any conception of. Every living thing on that world is connected to every other living thing, either directly or through a single intermediary--not metaphorically, or symbolically, but literally. The Gaia concept isn't just an idea there, it's completely literal and physical. The bad guys were warned why what they were doing was a bad idea, but didn't listen. The consequences weren't delayed by very long--predictable, but extremely fun to watch. Unlike Earth, Pandora is perfectly capable of defending itself. There's no need for people to speak out to defend it--if people cause trouble, Pandora will kick them off.
That's not exactly an environmentalism lesson--it's more about not being so narrowly focused on a belief or a goal that you miss seeing what's actually going on around you. Along with a healthy portion of watching people get what they deserved.
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