I rate this movie 5 STARS, and a must -see on the biggest screen you can find. IMAX had me ducking for cover and brushing insects and sparks away by reflex, even though I knew it was really only a 3D effect causing it.
Great imagination went into creating this totally alien, yet believable world. The alien animals, language, and plantlife were all amazing and well-thought out.
I didn't like the "humans are evil and want to destroy your world" theme that has pitted your loyalties between humans and aliens (a theme which seems to dominate Sci-Fi movies these days).
The good guys win -- but what's wrong with that? We have too many movies with anti-heros winning, already.