Silkroad back when it was good!

I got soft spot for Final fantasy XI.

WoW, nothing came even close and I've tried them all (not GW2 since I'm not playing MMOs anymore).

EVE Online

LOTRO WOULD be mine, but after level 30 it's all pay to play content, and f2pers have to grind 24/7 to get enough points to unlock some fucking map and quest packs

"Once upon a time, I used to play RuneScape. My feeble little mind found it very interesting! The quests were funny and the character were likeable. Then I got membership in it and a WHOLE new world opened up..."
Flash-forward 10 years.
"What the HELL! Why did I even start playing this piece of crap!? The developers sold their souls to money, the new quests are boring and cliche, hell, the entire game is just GRINDING now that I've done all the quests! I've just been wasting my time on it and didn't even have much fun now that I think about it. But now I'm addicted, because that's what MMOs do. I will quit it though, because no addiction can keep me playing it after what they did for money!"

So to sum it up- all MMORPGs are evil. There is no "best" one. The questions should be "Which is the least bad one?".
Pessimism, yay. :D

There was a perioid I was into WOW. Thats it. All other MMOs are getting boring after a few hours. And those based on pure grind like Lineage are the worst. How can a game ask of me to kill 200 mobs for a single quest, thats very sadistic.

Either Ragnarok or Diablo II.

Phantasy Star Online.

The first MMO I ever played was Ragnarok and 7 years later I still see myself going back to it every once in a while. Great memories.

WoW Vanilla and BC. back in the days it took weeks to collect the right equipment to be able to fight some big bosses. epic items were fuckin rare not like today =(

aion

Does Tribes count?

If no - EVE Online imo

RF Online

Probably the best war mechanic I've seen

Got boring though because of population imbalances on each side and too much noobs filling 1 race fast and pros switching to 1 race to dominate the game

Ragnarok Online, definitely! With Lineage II as a really close second =)

Tera online and C9

Counter Strike

Phantasy star online

PHANTASY STAR ONLINE

Sega Dreamcast, Nintendo Gamecube and PC. Used to play it everywhere.

I got me some fond-ass memories of WoWarcraft during the vanilla days.

Also digging the hell out of Guild Wars 2 at the moment. Haven't played enough to know if it compares but I figure if I find the right guild, it's my new love.

Pirates of the Burning Sea. :)

World of warcraft,age of conan,star wars the old republic and looking forward for the elder scrolls online.

Best? I don't know how best is defined. As for the most fun [I've had] is this, a spin off of the original EverQuest released for the PS2 set 500 years before the EQPC. Original EQPC was fun as well, although I only ever got to experience it through the project 1999. WoW was definitely fun as well, can't go wrong with instantiated instances.

Overall I find enjoyment in the first 2-3 months I play in an MMO (mostly since I love exploration and uncovering an entirely new world with every MMO) and most big named MMOs will offer a pretty nice world to get immersed in for a few months :>

Pocket Legends.

Sadly WoW and since then have been trying to find something that had that magic and yet to find it in games that are technically better.