Finally saw it yesterday. I'd give it about a 6/10. I know virtually nothing about Namor, but I liked the portrayal. I feel like the actor did well and the character has potential. Losing Boseman let this movie have a really good reason to develop a solid story over endless action scenes, but they wasted it. Story felt like a 2.5hr CSI drama with boring action scenes. If you're going to have a movie specializing in close combat instead of lasers, hire actors who can do that. I'm tired of all these action scenes where they're fighting for eternity, but no one is sweating, no one is bleeding, and no named characters ever die.
End credits scene was beautiful.