I would absolutely love to see an Aquaman movie done right though. A brief origin, getting to know Atlantis, then he discovers his brother is planning war on the surface world and we get huge awesome fights. And in the end, of course, he gets his hand cut off.
I think the best thing they could do for a Justice League movie is to have Flash and Green Lantern making fun of him for a good chunk of the movie, then Arthur leaves out of annoyance, only to return at the climax of the film leading a squadron of Atlantean aircraft and riding a fricking kaiju to help save the day.
EDIT: Also, X-Men worked because all the characters had the same origin.