Cliche ridden, but it's lively and the performers elevate the proceedings and Wan does deliver on a slam bam action spectacle with just enough dramatic weight to keep you engaged with the characters and story. An enjoyable time watching a solid movie that does have the issue of of being a bit too light often but still managed to throw in a wee bit of complexity on an issue or two which was welcomed on my part, though I wish there was more. If I had to say which had more meaty dramatics and resonance between the two, I would say Wonder Woman and Man Of Steel beat it by a country mile in that department. This is formulaic as hell. However... The formula is running on all cylinders and my worst fears, that it would be too reliant on four quadrant styled humor was not realized as they did not go overboard with "wink-wink" type jokes or word play and simply let Aquaman and his world speak for themselves.
Overall the film doesn't even attempt to reach any grand highs but it just works. This is apparent across all the non-production design/SFX/action aspects of the film. Take Patrick Wilson as Orm. He's not going to dethrone (no pun) Tom Hiddleston as the brother villain of the hero du jour. But... What he does in the film is more than good enough and it works. The arc Arthur has doesn't go too deep under the hood or ask any big questions or make any grand statements... But it works. He comes across well as the reluctant hero with a chip on his shoulder who none the less will do what must be done for the greater good and in doing so opens himself up to greater connections and responsibilities. We've seen it all before and they don't break much new ground. Momoa is both affable in the part but his issues are given enough weight to have some dramatic heft in the movie. Even people that aren't particularly great in their performances aren't also egregiously bad either. Amber Heard's Mera is a touch undercooked but it still works. Lungdren's undersea king looks great but his line readings (as always) are off and yet... That works out fine too.
What affected me most as a long time fan of the character that knew of the potential in adapting him to the big screen is that the feel started off immediately with the cliche's which I found off putting but as the runtime went on I found myself getting more and more into it so that by the time the final act gets going, starting with the hero finally embracing his destiny, yadda-yadda, and ending with the giant big budget blockbuster action scene, I was happy as a... uh... clam, and enjoying the hell out of seeing Aquaman and his world so fleshed out and pleasingly presented. Really, if you are a fan of Aquaman and you have known how much more he is than the public perception formed by Family Guy or Superfriends the last act of this film gives you everything you want. And the movie gives you the viewer, a great tour of this fantasy world withing the DCEU, and in spades. This isn't like say the Green Lantern film or the first Thor movie where you find the "Earth" stuff less engaging and interesting than the trips to Asgard or Oa. No, Wan centers a lot of the film in the undersea fantasy realm and keeps it lively and engaging. Wan deserves particular kudos for delivering a very specific and probably expensive type of 360 degree action, both on dry land and in the water. Truly this has some fantastic super hero action and in spite of the talk of it being too "CGI" I thought the effects all worked given the setting and were mostly blended well enough for me to not be taken out of the film.
Again, the formulaic nature of the movie may detract for some viewers and I can understand that. I mean, as fine as the score was, it LITERALLY uses "DUN-DUN-DUHH!" throughout the film. But maybe, I don't know... Maybe Wan was embracing the cliches so tightly in a hope to actually transcend them? If so... It kinda worked. Still if that aspect is a problem I don't think those in the audience that see that as a deficiency is going to be moved by that POV. This was quite a "safe" film, but then... I think it's obvious that as compared to shows on Streaming, Cable and TV that movie audiences aren't looking for too much complexity in big budget films these days, for good or ill. Another issue I had was that I think that for myself Yaya Mateen as Manta was good enough and I liked the twist to the story of how he becomes Aquaman's nemesis in that it was NOT as cliched and overdone a trope as I was expecting, BUT... I feel, despite what's implied in a post credit scene, that he took a back seat too much in compared to Ocean Master and wished there was more of him in the movie. Like so many facets of the film, for me, that would have added more, again no pun, depth to the overall film. Another few things going into the negative pile for me was that they young actors that played Arthur in flashbacks just never once convinced me that they were the same person only younger. On every level they had at best a surface physical similarity but in terms of line reading, and presence, I just never bought it.
End of the day though I think the good in general far outweighs anything subpar or poor in the film. I for sure wouldn't mind going back to this world for another adventure with Atlantis' warrior king even if it again, was a bit of a shallow exercise in fantasy spectacle. For this long time fan of Aquaman the best way to sum up the film is... "Hail to the King!"