I find it unfortunate that despite Avatar being the highest grossing movie of all time, almost all discourse surrounding it is either about how much money it makes and how it's overrated because le unoriginal plot and simplistic characters.
I'm not one of the haters, I really loved the original, the looks of Avatar elicit the same response in the brains of adults as that of children going to Disneyland for the first time, alot of what makes the world of the first Avatar movie look so great is Cameron lifting the bioluminescence/organisms of the shallow ocean and applying it to land, the second movie is just returning to the source of the inspiration. I do like the characters as well, but there's little depth to most of them. If only Cameron put as much thought/ambition into the plot and characters as he did the environment and visuals ,but alas we do not live in a perfect world.