This game is incredible. It tickles my nostalgia for old-school shooters. There's no real story, just run and gun action. Don't judge this game by these people giving it negative reviews because it's boring, because most of them hadn't even been born during the golden age of first person shooters, and thusly can't appreciate this gem of a game. Get it. Now.
This could very well be the greatest game ever made; however I'd know nothing about that because adjusting just about any option (particularly volume sliders) causes the game to crash. Don't pay the full price for this unless you want a digital paperweight.