Runescape then WoW... Then runescape, then cabal online, then runescape... I play it ocassionaly now, however i have noone to play with so it occurs once every 2 months for about an hour :P.
Runescape, then MU onlinne, then fake MU online servers, got bling bling and insane skill resets with innsane maps that the KR version had which most other versions did not.
Then got into WoW, and no more WoW, and then WoW, and then no more WoW, and then WoW again and currently quit WoW unless next expansion is good!
Runescape... but more notably because I played it for a veryyyyy long period of time was an MMORPG made by Joymax called: Silkroad. pretty much spent my childhood on that game...
Would have to be Runescape, best free MMORPG to date IMO, i don't play it anymore though, i also bought WoW but ended up playing it for 1 weekend so i havn't bought another subscription
Pirates of the Burning Sea, about a week after launch. There was a decent Aussie following. The game had great potential but development and support let it down.
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