It's dark, yes, without rays of sunlight, but my goodness every inch is lit. I can see maybe the dank crypt and maybe the druid grove, but the owlbear cave, the spider lair, the necromancer's lair, the hag lair, the goblin base basement, and THE UNDERDARK. I can understand one or two places, but I'm talking about almost every 'dungeon' in the EA a Dungeons and Dragons game. I am suggesting it could be better with appropriate ambiance. Areas which are intended to be isolated from the world above and quite correctly isolated without these beams of light you hate so much.
I just don't think you understand the idea of ruins being ruined. and there's nothing wrong with the design. I think these dungeons you're talking about are ruins underground and aboveground which have collapsed ceilings/etc.
