For the most part, the casting choices in the DCU films have been good (even Ben Affleck as Batman was not a total loss). That is still the case for Jason Mamoa as Aquaman, which is really the only true positive thing to say about the movie. He does make a splash, but the script is down right soggy.
The film does open with an origin story (which is fair, since it is not as well-known as those of Batman or Superman). We see how Tom Curry (Temuera Morrison), a lighthouse worker, finds a wounded woman named Atlanna (Nicole Kidman) on the shores. He heals her, they fall in love, and have Arthur. Eventually, Atlanna must return to Atlantis to stop the onslaught on Tom and Arthur after having run away from her marriage to King Nereus (Dolph Lundgren).
Nothing else to say 