Story: I even fear call it "story". It's filled with nonsense and extremely simple excuses or goals. Even the message they want to send is messed up.

Visual Effects: thankfully this side of the movie is good as the first one. Even if there are not actually new things (all copied from the first one or the real world).

Soundtrack: it was enjoyable and good as the first one, sincerely talking.

Conclusion: this movie is just to watch, there's nothing else to do. Shut down your brain and enjoy the visual, otherwise you'll face the story side and, well, it will make it worst. It's totally a shame, really, the main idea could be good but the way they developed it was totally nonsense. Ah, now that I'm thinking about the main idea of the movie thoroughgly, I would say that even that was nonsense. Really, I'm not joking, don't worsen the good taste the first Avatar movie leave to you watching this one.