Ragnarok Online
I miss this game so much! Especially my cool chocobo mount ;_;
Guild Wars
This was fun for a while, but the level 20 cap and the extreme emphasis on PvP turned me off before any of the expansions came out.
Maple Story
I actually still log on to MS from time to time to check out the updates lol
Dream of Mirror
Right before I joined quit Domo and switched to Fiesta. The weapon durability system in this game was driving me nuts.