Success isn't a measure of how good something is. Most critics and people who have seen Avatar have already discussed its most glaring flaws so many times now. But one thing I did always like was the actual world of Avatar and its creatures designs and the visual direction of the movie, lots of bright colours and stuff like that.
Lets put it this way, I thought the film was okay but I think that Avatar The World Of Pandora at Disney's Animal Kingdom is awesome. The World is more interesting to be in than the story that has been fabricated around it. The sequels seem to be hinting toward a new story / soft reboot so I'm interested. 2020 will be here before ya know it.