1. The movie is jaw-droppingly seriously gasp-inspiringly gorgeous. All those insane plants and creatures are amazing. The 3D stuff was pretty awesome too.
2. The story is one of the most predictable things I've seen in a long long while. Other than the visuals, there are absolutely no surprises to be had.
You've been warned. I give it a 5 - cause really all those floaty jellyfish things and the glowy plants rocked my world even if the story didn't.