6. Doom
Though I played the game at a time where I was too young to understand or care for the plot (the words were mostly senseless gibberish for me for which I had very little patience), I was thoroughly smitten with Doom and the 'Doomguy' simply because it came as a nice follow-up to Wolfenstein. It was essentially Wolf meeting sci-fi on a fateful night and producing a beautiful baby. This meant scarier monsters, fancier locales and more frequent testosterone surges. The point was simple press the trigger every time you see something move. Doom gave you an arsenal Sergeant Hartman from Full Metal Jacket would be proud of. There are the regulars pistols and fists in case you really want to knock someone's eyeballs out of their sockets. In the heavy-weights the game offers you a chainsaw, a shotgun, rocket launcher, plasma rifle and a crazy-assed BFG 900 (Big F*****G Gun) that is as effective as its name makes it seem. And there are just about as many innovatively created monsters to kill from things that throw fireballs to demons and possessed zombie humans. The game truly helped the FPS genre to evolve from the fledgling Wolfenstein state to something more spectacular and exciting. More importantly, it also sent a message across. It told the world that video-game violence was an actual thing and it was here to stay.