I prefer for actors to mumble then their character is supposed to mumble, and just use subtitles. Maybe it’s because I’ve gotten too used to subtitles from all the anime I watch but I always enable it for anything on YouTube or any other video content I consume.

Agree on the lightning part though, at least for action scenes, bad lighting is often used to cover for bad CGI. For narration scenes of the place is actually dark, I don’t really mind for me to basically only see silhouettes, it’s appropriate.