Well, getting slightly back to the issue at hand...
With all the reviews and previews that I've read, I've come to the conclusion that Doom 3 is little more than a revved up System Shock 2 without the character building aspect.  Especially when a little further reading told me how you have a PDA to receive emails from other people's PDAs and get crucial information...sigh, MFD anyone?
As for audio,  I agree with Con completely.  Nothing scared me more than hearing some previously unseen camera giving the "preliminary detection" sound or a zombie walking around in the distance...hell, take the original Doom.  That scared me too when I first played it.  Hearing those monsters...with only my popgun to protect me....23 health...no armor...wah!
Come to think of it, the original Doom still catches me off guard.  Somehow, I think Doom 3 is out of luck.  We shall see...and I wonder if there is a System Shock inspired mod for Doom 3 in pre-production...
Regards,
Yickle.
P.S. And 
here it is.