Aquaman is a better character than most people think. At least in the comics,at any rate. At one point. That's kind of the problem with talking about a character that has been regularly published for several decades. Different writers and artists provide varying degrees of quality.
Aquaman hit a high point in the late 70's when he was a headliner in Adventure Comics, an anthology title DC discontinued in 1983.
By that point, they had established Aquaman as the king of Atlantis, married to a woman named Mera who was an undersea queen another dimension (?), with whom he had a son, and a kid sidekick, Aqualad.
Since Aquaman had been little more than a back-up feature at this point, the writers were given a bit more breathing room than they might have in, say, Batman. So, the status quo of his life was being shaken up. He was already deposed as king. Then the villain Black manta captures him, Aqualad, and his son. Manta put Aquababy in an air bubble. Being like Aquaman, he needs to breathe water every hour or die. Time was fast running out and manta pit Aquaman and Aqualad against each other in a gladiatorial battle to the death, where one must die before the child dies. Aquaman, seeing no other way, attempts to kill Aqualad to save his son. But they manage to escape the area and free the child, only too late and the boy dies. Aquaman has his pet octopus carry the body of his son back to his wife while he pursues Manta, but once apprehended, he brings Manta to justice rather than killing him. Mera goes insane with grief and slips into another dimension. Aqualad, meanwhile is understandably shaken that his friend and mentor had tried to kill him.
Maybe I'm not summarizing this very well, but that's a lot of drama that didn't happen as much to other super heroes. He lost his home. His son died. His wife goes crazy and disappears. And his sidekick's faith in him is shaken. I think this raw material (and, yes, reading the actual comics is not as good as I'm making it out. The dialog is corny) could be made into a decent movie, if not a trilogy.
The sad thing is, that will never happen. For one, movies are a business and an Aquaman movie would by necessity be expensive. It would need to take place mostly underwater and doing effects like that the entire movie is likely to run up the cost astronomically. And of course, public opinion does not justify such an expense as most people don't even know who Aquaman is and most of the remainder consider him a joke. (yeah, Seanbaby's page was funny. Like, ten years ago)
But it could work, it just would need to be approached as an underwater fantasy rather than a super hero movie. But, that's how some of the more recent, successful super hero movies have been. Look at Iron Man. That ain't a super hero movie. It's a movie with a super hero in it.
Honestly, though. Aquaman isn't the slouch most seem to think. Even on land.