We had seen Jason Momoa's Aquaman in Batman v Superman (2016), albeit briefly, and also in Justice League (2017) before. Props to Zach Snyder for this inspired casting. It is obvious that Momoa loves every second of being in the role.
The events of this solo movie happen after Justice League (2017), and we also get to see Arthur Curry's (aka Aquaman) origin story in a series of flashbacks. The main story is adapted from Geoff Johns' Throne of Atlantis story arc from the comics, which might be familiar to hardcore DC fans. I think the main beats should be predictable to non-fans as well...
The movie's colour palette, costumes, and visuals are the best that I've seen in DC movies. James Wan, the director, should be commended for the spectacles as well as the pacing of the movie - it hardly wastes any time on non-value added expositions. The film borrows from a myriad of genres, including adventure (with homages to the Indiana Jones series - set pieces as well as the puzzles), horror (the end of second act), and of course comic book action. There are some slow motion shots that make you feel you are looking at a cover of a comic book (with all those heroic poses). Speaking of action, the fight choreography is top-notch. This interview with the director made me appreciate it even more:
In short, Aquaman is a beautiful and entertaining movie, with likeable protagonists, that helps you escape from your daily routine. I'd give it a 9.5/10!