I was told at the time that it was pretty good in 3D at the cinema. A decade later I'd say it's still a (psychedelic, immersive) visual feast and everything else is beside the point. The plot is completely formulaic and events follow events briskly. (I have yet to see The Lion King and now perhaps I don't have to.) The people are essentially a smoogery of Amerindian cultures. I doubt Gaia is coming to save us on this world. I felt I'd seen it before (coarsely The Matrix) and after (roughly Endgame) without that mattering a whole lot. Sam Worthington was better than he ever would be again. Zoe Saldana was somewhere in there.
Dana Stevens tried for an internet metaphor. Roger Ebert went in boots and all. Manohla Dargis.