Player-versus-player combat is always one of the stickiest situations to deal with in a massively multiplayer game. When implemented properly, PvP allows a level of player/guild interaction, and politicking that the safer "Theme Park" MMOs simply cannot match. Unfortunately, unlimited PvP also runs the risk of alienating players who are just looking to quest, adventure, and fight monsters, and don't want to deal with other players looking to ruin their fun. Attempting to balance the two was the tough challenge that the developers of the just-released Lineage II faced. It's a bold choice that the developers should be applauded for.