Doom 3 is really fun so far. It does exactly what it is titled, it gives you a sense of doom. I don't think I've ever been as freaked out playing any other game and that is a great plus. Just like how you sometimes want to sit down to a good scarey movie instead of an action or a comedy, Doom 3 fufills such a desire for a horror game. Granted, it would be a little more scarey if you didn't have more than able weapons to dispatch your foes, you still get creeped and and feel the sense of dread every time you hear a banging noise and you always catch your self swinging around to check that dark corner.
Graphically it is amazing, it works even suprisingly well on my Radeon 8500. I'd thought 800x600 or even 640x480 would be unbearable but it isn't, although I'm sure I'd never want to go back to it if I got used to 1600x1200 and ultra quality
My major beef with the game is the fact that it is so dark. Now they could have had the excuse that after the "accident" the lights malfunction but even before hell breaks loose (literally) you find youself wishing you had a flashlight even when the building seems to be functioningly perfectly. I don't think there is a room in the game that is normally lit, ever, let alone brightly lit.
So that brings me to my other beef, since you always practically need your flash light, you'd think your character would find someway to hold a light and a gun at the same time...but not. Fortunately the light isn't as lame as Halo's or Half Life's which requires recharging when a simple battery powered light from our time (and not their advanced future) lasts several hours. Well the Doom 3 light never runs out of juice unless you're hit wiht an EMP (which provides for some of the freakest parts of the game as you're often forced to fire blindly into the dark)
To sum it up, I think the only people who would not like this game are people who don't like to be afraid.