Justice League: Throne of Atlantis is good. It is not great but it is enjoyable. I want to see the next film in the series.
This movie serves as an origin story for Aquaman. As the movie opens Arthur Curry doesn’t know that he is half-Altantian. Also as the movie opens, some Altantians are unhappy sharing the world with humans. Orm (aka the Ocean Master) is unhappy.
The Justice League has not disbanded, at least not officially. However the team is not together at the beginning of the movie. They move into action when the Atlantians invade the surface world.
As I said, this is good. It is a little short and maybe a few minutes would have been nice to explore the characters a bit more. It is not great but it is pretty entertaining. It is inspired by the Throne of Atlantis storyline from Justice League and Aquaman comics.
It would be nice to have an Aquaman solo animated movie. This might be as close as we get for awhile.