i play quake and the frame rate and monitor refresh rate makes a huge difference. If you want to be good you need 120Hz monitor and stable 125fps. It actually makes visible difference. I usually force enemy models to a bright color and remove all the fancy post processing effects. If the games allows for it configure it like this:
http://www.esreality.com/files/inlin...7-cfg0000.jpeg
customization is everything ))