My problem with UO PvP was that it was weighted heavily in the "red's" favor. Most people who didn't PvP primarily ventured out in their trusty gear, silver Long Sword of strength and all, with a full pouch of reagents and a key to their house (back when keys were lootable).

Meanwhile the PvP'ers ran around either naked or in ghost robes with a handful of reagents, just enough to Corp Por, Corp Por, Corp Por a hapless bluebie wandering off on his or her own. Also, since it was not a grouping type of adventure MMORPG, it meant that most folks were solo, even if there were 5 or 6 people in the area. This allowed the reds to coordinate strategy and nuke the crap out of the bluebies before they could react.

Granted, this assessment comes from someone who sucks at PvP, so I am biased. Still, I usually got back at those folks by finding their house and then marking the spot and I'd go back there later and do the home hack bug and loot the shit out of them.