"IMAX" 3-D. Agree with your review in broad outline. I actually expected less of the script than it delivered, and think that some critics faulted Cameron for failing to deliver something he hadn't attempted. Pandora was a densely-textured, immersive world, and the nine-foot CGI smurfs moved and emoted believably. As to the "predictable" development...well, old son, if we're thinking of the same thing, this is actually a hallowed, decades-old cinematic tradition, and an ironclad rule of "action" screenwriting: when the villain finally Gets His, be he never so cold, cruel, sardonic, pitiless, there must come a moment at which he realizes that his doom is upon him, and in that moment his composure must visibly crack just before he is crushed/impaled/disintegrated/blown up/devoured by piranhas/dropped from a great height/poisoned by a cyanide canape/bitten in half by a T-Rex/subjected to a rigorous tax audit, etc., etc. The villain is almost never rendered instantly and unexpectedly dead by a headshot fired from a high-powered rifle by an unseen sniper.
cordially,