I know people constantly ramble on about the capabilites of the PC. But JUST DO IT. I neither understood what the fuss was about, at the time controllers seemed perfectly feasible to me. After playing on a PC for a year, and again playing FEAR on the 360, the difference was night and day. I remember the xbox version of FEAR being challenging on extreme diff., while on the PC it was a piece of cake. Now I understand why. It actually feels like you are crippled and stuffed in a box with no room to stretch. Going from 60 fps to 30 on a FPS is just awful. The physics and lighting of the game is completely stripped out, to the point that the act of shooting enemies is not as pleasurable. Every other FPS i've tried after suffered as well. And these are the games I used to love.
Not sure if there are people who fall under this criteria, but seriously, you deserve better.