I know this almost goes without saying, but any gamer alive should play the Half-Life games. Even compared with the modern flashy big-budget single-player shooter extravaganzas of today (I'm looking at you, Far Cry and Bioshock), which are rightly heralded as amazing games, Half-Life makes your jaw drop at how amazing of an experience it is to fight throuth the crumbling Black Mesa facility battling humans and headcrabs alike. This game really makes you realize how much Jason Brody, Booker Dewitt, and every other major fps protagonist since owe the man with the crowbar, Gordon Freeman. If you are a sane human being who can play a video game, there is no excuse for you to not play Half-Life. None!