The greatest PC game ever made?

[death_star_gone]

In terms of pure gameplay experience, you can't beat Quake 3 Arena (and all its mods). It's focus was only gameplay, and threw away all pretense of telling a good story. Its bots were really good, and the best part of it was the multiplayer- play with friends, play with strangers, or just jump around on your own. Learn a multitude of skills to pull off crazy shots and maneuvers, or just play however you want. It was fast paced, fun, and just plain amazing. It spawned an uncountable number of mods, and is still played actively today in the form of Quake 3: Challenge ProMode Arena, and also as Quake Live (which I play).

No words... just pure amazingness.