You've seen it before. It looks better here, but that's about it.

Rating: 4/10 (27 December 2009)

This review is full of spoilers.
You've seen the story before. It's basically "Pocahontas" on some other planet - even with silly song numbers throughout the movie. You've seen the whole "everything is connected to everything else" deal, and glowing effects all around the characters - in the 80's, in "Tron". You've seen the battle between the natives against the evil empire - in "Return of the Jedi". You'll feel a bit ill when you realize you are looking at thousands of Jar Jar Binks on the screen all the time, just like in the prequels. And everything else - you'll just know Cameron simply stole it from "The Matrix" trilogy (right down to the "plug-in" sequences and the human-controlled robots). There's even a "Tank" character, but this time it's a female - and it's also from Latin America! You'll immediately know which characters live and which ones will die at the end. You won't have to guess twice at who the bad guy is. You'll know exactly what will happen and how it will all end.
You'll notice how poor the acting is (come on, the lead from "The Hottie and the Nottie" as a scientist?). You'll be bothered by jumps in continuity ("where did that guy come from???"). And you'll find out that James Cameron simply cannot edit a movie to its proper length, even if his life depended on it - you could cut 1 hour of this one and it wouldn't detract much from what it is.
And you'll have nightmares all over again about Celine Dion - when you listen to the songs on this one. It's "Titanic" music all over again. Same conductor, same style of music. The song at the end is a dead ringer for "My heart will go on". Ack.
Sure, the visuals are awesome - if you catch it on 3D. If you don't, well, you'll be bothered by things that you just know should be jumping out at you, but in 2D, they look like someone's afterthought.
6 stars, only because it looks awesome. But I bet I'll forget about this one in 2 or 3 months, tops.