Doom 3 reminded me alot of a game design class I went to years ago. We were handed a peice of paper on our way in that I believe still holds true.
1) making a game dark doesn't make it scary, it makes it dark.
2) giving it a large breasted woman doesn't cover plot holes, it just makes 13 year olds have to buy new controllers.
3) Adding over done "spooky music" doesn't make it scarey. (see 1)
4) Things can only jump out so many times before people start to consider it like a 5 year old. The first time it startles you, then it's just annoying.
5) GOOD GRAPHICS ARE NO EXCUSE FOR BAD GAME PLAY!
6) GOOD GAME PLAY IS NO EXCUSE FOR BAD GRAPHICS!
7) There is no excuse for bad story lines. If you aren't going to make it a good one don't make it at all.

Shoot anyone that refers to a shooting game as an RPG.
9) Players will ruin every large player based game. If you make one, accept this.
10) Unless you know the damage role for magic missle with 30 charisma, at level 25 you are a noob. Don't call others noobs. If you do know this you can call others noobs, but keep it down because you still live at home.
11) Your games will be out dated before you come out with a new one.
12) If you want to scare people give them a story line good enough they start forgetting they aren't in the game. Good graphics with proper sounds can do this.
13) You are a geek, get used to it.
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on another note yes there is a program to turn the lights on. It's sort of like having sex with a fat person. You turn them on, and as soon as you can you turn it back off. it only gets worse the more you see. With the "lights on" you do see they really didn't give a crap about graphics when you compare them to other games. They took the cheap way out, and charged people alot of money for a sub-par game. If you want blood and guts go watch some FWA matches.