When you have a movie that takes place mostly in dark, lowly lit settings, the brightness factor is always going to be a challenge.
Godzilla: King of the Monsters is one such film, as it bathes its settings in various shades of blue and orange, and takes place during some very cloudy weather events.
Daytime scenes are coated with the usual grey dimming, but the lowly lit scenes are a bit of a chore to watch, and that’s a good majority of the film’s action.
While mileage always varies on this sort of thing, as the brightness partially depends on how well your theater maintains its projection equipment, Godzilla: King of the Monsters has a brightness problem that extends through most of the film’s running time.