Their retention rate is fine. They have Patch-Hoppers the same as here, but this idea that somehow WoW ruined mmos when it practically DEFINED then and KEEPS INNOVATING is ridiculous. I get it - you hate WoW, anything to do with WoW and you think that Final Fantasy can do no wrong. However, I cringe whenever I see someone act like that game is somehow "easybake oven" compared to this one. Feel free to link your Heroic Garrosh kill or your Brawler's Guild achievements or even your Arena rating.
This is a good game - I play it and enjoy it - but WoW is a freaking hard one at high levels of gameplay. There are a lot of good lessons there that SE could learn. They have already implemented some of them to the playerbase's collective delight. Look around you at some of the systems you are just now getting to enjoy. 90%+ of them had already been thought up, tested, implemented, and bugfixed somewhere else.