I agree, I want to be scared when I go into dungeons. In Oblivion it was never scary and that is something I feel could improve the games.
It would be good if the only way of you seeing was to use your torch (in Oblivion torches were useless) and even then you should only be able to see a few meters in front of you.
It would be good because it means you would be attacked out of nowhere because your light source would give away your location to monsters but you would have no idea what was coming at you :chaos: