I never found a game like Shadowbane, but that is possibly because I lack gaming experience but from what I can gather, maybe you would like to check these out:
DAoC, Dark Age of Camelot
RYL, Risk Your Life
WYD, With Your Destiny
Knight Online
AoC (never even played but ehh...)
I don't think any of those games had the massive selection/customization Shadowbane did with so many race and class though(even interface), nor do they really have city building. The games I listed do have guild battles though, Maybe I might think of some more
