I watched it last night, and up to a point it was very good..
BUT..

The main character gets lost in the big GIANT woods
He meets Netiri (or how ever you spell it) And at first she talks like any native who know rudimentary english..
You are like baby, you go now.
Then within moments as they walk along..... she suddenly starts talking as if english is her first language...
There is a scene where some glow in the dark seed pods cover him... and she is all awe struck..
but the language goes from "you go now'...
to "Like OMG.. the sacred tree just farted all over you.. wanna come down to my teepee for some cheetos!!"
(not really but from broken english to first language is VERY VERY Jarring.)

The space ships, drop ship, helo types.. mecha battle suits are are very well done.
The creatures are very well done, but are 6 legged multi eyed versions of prehistoric mammels and dinosaurs...
The music is straight from Aliens and Terminator...

And yes with enough stone knives, marine corp trained natives and a half sentient planet...you can beat back
the corporate baddies who want.. Unobtainium... which was first used by the movie The Core...

We called it Dances with Giant Ewok Smurfs on Steroids...

Oh but don't miss the great inspiring speech that suddenly makes you start to spout, Brave Heart, and Winston Churchill.. OH..
AND very very Henry the 5th, it is more like Henry the 2 1/2th.. but this ain't no Agin Court.