I personally thought this movie was very good (but maybe 4.5 stars instead of all 5). The main purpose of this movie was to take you on an adventure through a very creative and beautiful fantasy world. The plot is a fairly simple man vs. nature story, even though this one has an extra little twist on truly being in touch with nature. The imagination and scenery of the world is really where the movie excels.
I would also recommend the 3D version if you're willing to pay the couple extra bucks; and get over wearing the dorky looking glasses. It isn't a jump out in your face movie, but the 3D look adds a cool depth to everything.