I've only played a few MMORPGs (Anarchy Online, DAOC, EQ) but I would say Lineage II beats them all out of the water. It is as PvM or PvE as you want it to be, and as PvP as you want it to be. It has a karma system that I think works very well, and that in some ways discourages people from ruthlessly pking people everywhere. But if the other person hits back, you can have a prolonged duel that is very engaging and difficult -- or not, if the person who's hitting back is low level, you can kill him/her in a few shots without penalty. Anyway, it's certainly not for everyone. I would recommend playing the open beta for it when it comes to the US...
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How is it in comparison to the other mmorpgs you've played? Is it mostly PvE based? And I don't want to get into this age debate again, lol
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