Yup, the main conflict of the story has been done many times before and portrays the big, bad humans exploiting the weaker race once again.
But what do you expect for a 3D action move?
The premise of the story was done really well as far as humans controlling avatars. I loved the concepts in the alien world. And the effects were outstanding.
If you want a killer-good plot, don't go to see an action movie, period. But this story was better than most and the effects make it worth the trip.