Adventure Quest, DragonFable, MechQuest and other Artix games
Adventure Quest and Dragonfable were basically my first online MMORPGs (Not really MMO, but meh). And honestly, they're surprisingly good fun to this day! Sure most of AQ still looks like it was drawn in MS Paint and the UI can be dodgy or poorly designed but it's kinda neat.
Thing is though, the other day I started a new character in Dragonfable and Mechquest and played each for about two hours straight. Man, people say WoW is addictive, Artix games are pretty much digital drugs!