Finally saw this. I haven't listened to the commentary just yet but thought I'd put my initial reaction to the film itself.
An awful first half. I couldn't believe how bad some of the early dialogue was, and how clumsy and forced the exposition was as well. And that godawful narration....
That said, there are some very powerful moments in the film; lots of wow moments and crowning moments of awesome which I'm pretty sure is what made the film so successful. It's good manipulative entertainment.
And the world looks great, so great in fact that I wish Cameron had removed all the human elements from the story and created a sort of Apocalypto -like movie. Granted this would have changed the core story, but then that feels like a regurgitated Dances with Wolves anyway.
That said, my favourite 'human' bits were probably the video logs. A bit of wry humour in there and probably the best acting from Worthington.
Imagination will often carry us to worlds that never were. But without it we go nowhere. - Carl Sagan