The trades have spoken and they're unanimous in their praise.
Variety calls it: "The King of the World sets his sights on creating another world entirely in Avatar, and it's very much a place worth visiting. The most expensive and technically ambitious film ever made, James Cameron's long-gestating epic pitting Earthly despoilers against a forest-dwelling alien race delivers unique spectacle, breathtaking sights, narrative excitement and an overarching anti-imperialist, back-to-nature theme that will play very well around the world, and yet is rather ironic coming from such a technology-driven picture. Twelve years after Titanic, which still stands as the all-time B.O. champ, Cameron delivers again with a film of universal appeal that just about everyone who ever goes to the movies will need to see."
ScreenDaily proclaims: "Twelve years after Titanic, James Cameron delivers his latest blockbuster and once again takes cinema to a new level of remarkable spectacle. An epic film born entirely of Cameron’s imagination, Avatar uses tailor-made technology to create the most astonishing visual effects yet seen on screen and blends them seamlessly into a mythical sci-fi story about an ancient alien civilisation fighting the encroaching human menace. It’s an unprecedented marriage of technology and storytelling which is on the whole remarkably successful."
The Hollywood Reporter declares: "A dozen years later, James Cameron has proven his point: He is king of the world. As commander-in-chief of an army of visual-effects technicians, creature designers, motion-capture mavens, stunt performers, dancers, actors and music and sound magicians, he brings science-fiction movies into the 21st century with the jaw-dropping wonder that is Avatar. And he did it almost from scratch."