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Being a bit older, 33, I grew up on EQ and FFXI mostly. What really kept me hooked on those two games for years and years was the amount of time it took to "complete" the game.
IMO one of the best things about FFXI was that every single level felt like a struggle, in a good way. So many games let you breeze through xontent to get to "end game", but once you get there it just peters out.
I played FFXIv at launch for about two months, but coming from 5 years of FFXI I just couldn't stay with it. I'm very excited for ARR and I'm hoping that solid group content and a lengthy campaign can give me the same sense of accomplishment that EQ and FFXI did.