Doom is a classic in the true sense of the word. It spawned techniques still used in First-Person Shooters today.
All are fantastic games, but Doom outranks them all. After all, Doom is simply legendary among shooter fans, even more so than the seminal CS. Thank Doom, with its crude 2D sprites, blocky graphics and unparalleled gameplay.
Normal person: You fail it. Without Doom, Halo would have never existed, so suck your boyfriend's cock and chill out.
Cool, did you get the chainsaw yet?