Comment by gww

A few of the older 3d MMORPGS did try to instill some of those mechanics. Examples include:

1) Asheron's Call (which had a very active mod scene and now an emulator scene). I don' think the servers are nearly as popular as UO though.

2) Shadowbane (this one was heavily guild based but it was fun being a bit of an outlaw and PvPing random people and guilds).