best mmo is by far the guild wars series ive never had so much fun with a game.
Guild Wars is not a MMO simply because the number of characters are limited to separate servers when you actually do anything interesting.
As for myself I use to play Asheron's Call for 5 years back when I was a kid. Never really played a better game, or had better PvP. The best part about it was Darktide, the server where there were NO safe zones, at any point in time anyone could come and kill you, guild mates, high levels in low level zones, any time any place.
It forced alliances, people to forge together to hold off the larger guilds, to make war and peace and group the smaller guilds together to fight off Blood (the biggest baddest PK (player killer) guild of the time).
It was amazing, there were respawn zones called Lifestones, which your guild usually claimed as its territory. Now some of these were very valuable and placed near the main cities, so obviously there were clan wars from time to time when the giant clans all found themselves wanting a single lifestone and trying to force enough loss on the other clan to pull out.
One of the BIGGEST things was real actual loss: if you died, you lost experience, your most valuable items on your body (came up with death items, things to keep that are highly valuable to try to keep from loosing your good stuff) as well as having a vitae penalty, if you died you got a 5% loss on all abilities, then another 5% next time you died, stacked until you hit 40%.
Overall it was an AMAZING game, then carebears made mansions and houses which had safe zones that alliances could group at which were protected by a barrier, killing Darktide.
I find games like WoW and Guild Wars sickening, any game where you can't kill the guy next to you for any reason just isn't fun to me.
Well, have a good night guys sorry for the long post, just reminiscing over the old days.
P.S. when they come out with a game when you can actually KILL anyone for any reason and there are no safe zones (cities, houses, ect) then I will be happy again. But people are just afraid of losing their valuable time and therefore there is nothing actually lost. I remember times when I would lose my weapon, and all my armor in a single death, then have to grab a spare set, fight through a horde of monsters and grab it back, or be killed in PvP and find the other guy took all my ****. It sucked from time to time, but it definitely made you feel better and more connected to your brothers in the clan.