This isn't a Marvel movie, and it's a good thing. Do we really want superhero fatigue to set in ASAP?
It's ~140 mins, which falls in-line with every other comic book movie.
I don't follow. While they tried to make a spectacle of some scenes that deserved otherwise, there is a ton of content that is rightfully 'bombastic' and "epic". It's a movie about Kings, war, and Atlantis...
Black Manta scenes are the only ones in which I'd tentatively agree. His theme didn't always fit his scene. Otherwise the music was phenomenal.
This is a case of mass-CGI on the big screen. Dawn of Justice suffered the same problem at times. On a 50-60" TV, though, I don't think anything will appear muddled.
Not every character "developed", but the main pieces all easily changed from beginning-to-end (Arthur, Orm, Kings, Mera, etc).
This is a comic book movie...