‘Avatar’ is not simply a sensational entertainment, although it is that. Its a technical breakthrough. It has a flat-out Green and anti-war message. It is predestined to launch a cult. It contains such visual detailing that it would reward repeating viewings. It invents a new language, Na’vi, as ‘Lord of the Rings’ did, although mercifully I doubt this one can be spoken by humans, even teenage humans. It creates new movie stars. It is an Event, one of those films you feel you must see to keep up with the conversation. (Roger Ebert)