Doom 3. I feel like I'm fucking blind playing this game, because the position they have the flashlight set in, and how they designed all the normal enviroment lights to be so short. It makes my eyes hurt after a while, not to mention the agrivation of not being able to see what's clawing/shooting/biting me. I heard a long time ago one of the first mods for Doom 3 made was a "duct tape" mod to let you use the flashlight and a gun at the same time, I should look into that.
Also, I just played the Call of Duty 2 demo. When I click the game's "optimize settings" button, to make it set the video settings for my hardware, it turns on antialiasing 4x, with all the other settings on medium/normal. It actually runs amazing like that, too. I'm not sure if the game as a whole is just amazingly optimized and runs great on my hardware, or it's specifically designed to have AA on and run fast with it. Gonna see if I can trade it for high detail textures and models later.