This is the game that introduced me to online gaming. It also sparked my interest in first person shooters.
Graphics - At the time of it's release, this game had jaw-dropping graphics, and they still look very decent now!
Sound - Hearing rockets blaze past your head and machine gun bullets hit the floor is music to my ears.
Value - If you plan on playing this game over the internet or at LAN parties than it has superb value. If you are only interested in single player, it is still worth purchasing, but your will not play it as much as you would the multiplayer.
Tilt - I love this game and would recommend it to anyone looking for a great multiplayer FPS. Quake 4 is out but who cares?