My favorite game was an old MMPOG called EverQuest. It had guilds, platinum pieces, and rare and epic drops. The most fun came from joining a guild and getting to know people and the time and patterns of when they could get online and play. I enjoyed almost everything about it including the market and player driven economy across each of the servers. They were all independent and ran with their own heirarchy. It was an awesome experience. The biggest issue was server side lag and massive disconnections when you gathered enough people to be a boss. I was on the ECI server. Great time had by me, maybe not had by all :)