I don't necessarily disagree. "it's a small world" is a simple ride with no plot or conflict, but it's lovely and perfect. If Na'vi River Journey was a series of interesting vignettes and beautiful vistas, I wouldn't even complain, but it's just one location with one thing of interest for the entire ride. Again, I think my bayou example is the perfect comparison. There's fireflies, an alligator, some plants, and then animatronic with some music. A magnificent scene, but it's just one scene and it's incomplete without Pirates of the Caribbean to follow. Na'vi River Journey just feels incomplete, like it's the beginning of a ride that just abruptly ends.