The word that always comes to mind when I think of Greyhawk (and Blackmoor and City State of the Invincible Overlord, too) is "primordial." Not just in terms of the aura that hangs over the setting (the formative days of civilization, when lands are wide open and lawlessness abounds), but also the fact that these are the earliest settings for D&D. The players in the game are actually players in that formation, and though much is lawlessness, characters can play a big part in pockets of the world. I remember reading that City State is a Lawful Evil city, and that makes sense. The emphasis is on Law, not good or evil. Chaos rules the land, with vast empty places and enemies and creatures everywhere. The excitement (and practical need) for adventurers, is that there are plenty of places that need taming. Adventurers are in demand, dammit. You can see, then, that civilized areas have authoritarian rulers that provide safe, if corrupt, harbor. This is the Greyhawk that comes to mind, and if it is tackled again by WOTC, the aspect I hope they play up.