The setting was great. The plotline was retarded, and childish.
Disney/cameron can promote. They probably should have done more to keep the brand alive. it WAS HUGE back then... but yeah. has lost a TON of power, from nothing keeping it alive.. and how sadly superficial the plot was.
(I'll admit I had actually thought it came out before Lord of the rings and harry potter..)
I'd say Avatar's initial success was the cgi/3d tech, combined with the popcorn flick bombastic visuals, and intentionally superficially endearing characters. big cat eye people intentionally made to look like babies to pull the heart string. Cameron literally saying, sad pouting cats on purpose.
Half the marvel movies have that same design theory. they fall apart on rewatch, or when you start thinking about logic, characters, motivations, plot, etc. But they are fun that first time you watch them, so get butts into the seats.
I'm not really sure how the story continues on Pandora itself in interesting way.
Is Avatar intended to pull from Dune? is Pandora Arrakis?