The plot is somewhat predictable and some of the dialog is terribly written, but . . . the world of Pandora is one of the more fully realized and beautifully depicted in of any (including earth) in film. Much of the flora and fauna are clearly drawn from the undersea world of SCUBA - but set on land or in air. Add in the flying creatures and so forth . . . and in IMAX 3-D . . . you have a visually arresting film. The discovery of the planet (we learn through the experiences of the "avatar") drives much of the movie's first half, while the latter half is driven by the action of the conflict between the Pandorans (or Na'vi) and the humans, which makes for rollicking action sequences. The 2:40 flies by. A "must see."