99% of the world is, simply put, a randomly generated mess that lacks any feeling. It's obvious, as soon as you leave a city, that no thought went into the world whatsoever. In place of actual content, we have "random" encounters constantly. Every 15 seconds you can be sure that a group of mobs will spawn in front of you. Mobs have no life of their own; they're generated just because the player is there, and it makes the game more like Asteroids than an MMORPG.

Trying to trick players by having a random number generator do your work for you is a poor, poor excuse for content. It will not fool anyone. There's a feeling you get in a game world when you explore and find new things around every turn... new structures, creatures, places with a purpose. Places designed by a human for interaction with humans. Having the game randomly place blobs of mobs everywhere will never, ever duplicate that feeling.