Nutbutter, this is what I wrote about Doom 3 at some other place:
This is a great game.. but I feel like I should point out that the only revolutionary thing about it is the rendering engine and the visuals. The gameplay is standard. You fight for your life as you move from one location to another. This is all fine and dandy though, because the game paints a freakishly intense atmosphere unlike anything I've ever seen before in a video game. The first few levels had me literally scared to progress onwards. I would be standing before an open doorway and I would quit the game thinking "okay, this is too intense. I can't handle this right now." Then after a few minutes of sitting and staring at my screen, I'd boot up the game and start playing again. The "OMG FUCK ME" scares wear off after a few levels, once you get used to the enemies and such. But even now, like 70% done with the game, I still feel genuinely scared and nervous exploring the base.. even though I may not be jumping and yelping like a little girl like I was during the first few levels.
Anyway, what I'm trying to say is that the game is fucking creepy. It does an excellent job of making you feel uneasy and scared and alone. Plus it's fun! Really fun! I've had a hard time prying myself away from it.
So in summation: this game has a heavy atmosphere and is fucking intense. Excellent game so far. I still have another 30% or so to go. My only real gripe is that it seems to be a bit too easy on Normal. I wish I would have put the difficulty up a notch for my first playthrough, but whatever. Definitely pick it up if it sounds like your thing.
So yeah, I think it's a good game!