No, no, no, no, no to this topic. If anything, it should be even darker in dungeons. Diablo and a D&D-based RPG are two totally different animals. As others have mentioned in this thread, if you're exploring a dungeon, you need to go in prepared with torches or spells, etc., to light the way. I wish they'd go even further and make you pack rations, put in a time system so you get tired, etc., to make it more like you were really going on an expedition. But as it is, I'm so glad they stayed faithful to D&D and made you actually think about what you're doing instead of just blundering around everywhere with no consideration for the circumstances or environment.
This. I'd actually love to have a "pen and paper" mode where hunger, thirst and fatigue are a thing... but one step at a time, I guess.
