I still think with the right director and a big enough budget, Aquaman has the potential to make a fantastic movie. There is a lot of unexplored territory that comes with having a superhero who primarily lives and fights underwater. And while people deride Aquaman as basically being the Flipper of superheroes because of this, I don't think it'd be terribly hard to come up with at least one movie that justifies his involvement. It's not like they're going to have to come up with a new aqua-based crime every week. It really has the possibility to bring something entirely new to the genre.
But a lot of that is going to hinge on getting someone who knows how to work with the material. To do Aquaman justice, they're going to need someone that can push what can be done with special effects in the same way the Wachowski did with The Matrix. The kind of underwater action that Aquaman requires to sell the film is something that has barely been explored. DC/Warner just need to realize this and not approach this like it's just any other superhero movie.