What Makes Online Worlds Fun To Explore?

Thanks to IGN RPGVault for their roundtable discussion on building satisfying MMORPG worlds. Rick Priestley from the forthcoming Warhammer Online argues that "There's no point in having a huge world if it's empty. Better to have a smaller, well-realized one with plenty of activity and player density", going on to voice "concerns with the idea that you should give large areas of the gameplay over to the players - building houses, raising taxes, leveling cities and so on", lest "anarchy" ensue. However, Gordon Walton from Sony Online addresses "lack of [graphical] richness", arguing that the "...primary business challenge we face with art is that the costs for first-class art continue to rise faster than our market is expanding, and that MMOGs require tremendously more art assets than the vast majority of standalone games."