It's a pretty good movie and fun to watch. The visuals in the underwater sequences are very impressive. There's a part in the middle of the movie that feels out of place and has some glaring plot holes, a treasure hunt sequence that would fit better in an Indiana Jones style adventure movie, but even then it is still fun to watch.
I have to admit I was worried about an Aquaman movie, if it would be treated seriously or come across as yet another thing trying to make a joke of the character. This one avoided falling to that trap and turned out fairly well, I think.