I should correct my statement - I don't find them "too dark", but I find them dark enough. I feel like I have trouble seeing in dungeons without lights just fine.
But then again, I have anxiety also. I'm not afraid of the dark, but crawling through dark dungeons in these Bethesda games triggers some of my anxieties. I think some of it has to do with the fact that I was suffering through some of my worst bouts of anxiety while playing Fallout 3.
I understand now, I find the lighting fine as well not much issue with that, but I have to really light up an area as I loot because I do not want to miss anything.
In Fallout there was a certain tension to having things jump out on you in the dark, that game certainly gave a few jolts and thrills for sure.
The ghouls was the worst you could hear them on the distance and then all of the sudden thay would screech and be on you because you misjudged how close they were in the dark.