Crysis
Why It's Great: Crysis is literally one surprise after another. You're dropped on North Korean territory in a government issued nano-suit, and charged with taking down the radical KCP faction. So far, so good. But halfway through your pursuit, a race of advanced extraterrestrials enters the fray. Throw in some surprisingly open-world gameplay, astonishingly detailed visuals, and the option to switch between your nano-suits abilities on the fly, and you have one of the most complete PC shooters ever created. While the steep, steep system requirements definitely took their toll on the game's sales, Crysis is one of the few games that was actually worth the investment in new PC hardware.