8. Soldier of Fortune
In an age of many PC-based first-person shooter games, Soldier of Fortune was...just another one. You're a mercenary hunting down neo-Nazi terrorists in possession of nuclear devices. Fairly standard fare, right? Well, the main reason anyone bought this game was because of the brutal GHOUL technology that developer Raven Software built into the Quake II engine.
Gore factor: Three pints of blood, separated. The big deal about the GHOUL system is that it allowed you to isolate over 20 different parts of the body. Shoot someone in the leg, and they limp. A shotgun blast will tear that limb right off. It was grimly fascinating for the time — to say the least. Ah, what one does in the name of entertainment.