I was rooting for the humans. I wanted them to wipe out the tribals. The spiritualism pissed me off as did the fact that they thought the humans were stupid. Not advisable considering they were smart enough to travel to another planet. But then again supiriority via mysticism always pisses me off.
Let alone the Deus Ex Machina at the end. How pradictable, the humans lose and "they go back to their dying planet". I highly doubt that, the humans would be back in a month and own all the aliens from orbit. Actually thats reminds we, why didn't they bomb the navi from orbit again?
BTW I actually really enjoyed the movie. But the plot was very much predictable and safe. The film functions as a visual feast, but as a narrative it didn't make any impact on me.