I absolutely love the ride, and the Shaman is by far the best audio-animatronic in the parks. FoP blows everything else out of the water of course, so RJ suffers in comparison, and suffers because people just get in line because it is "shorter" than FoP... And that makes my point; I love RJ, no way would I wait more than 30 min for it just because I don't stand in line that long for any ride.
FoP carries itself, RJ is much better IMO if you've seen the movie and enjoyed it. Love the movie, so I love seeing the animals, the Na'vi, hearing the music, and seeing the workmanship that went into the shaman is awesome. Both rides let you experience different aspects of Pandora in different ways.