World of Warcraft has spoiled me in the MMO realm.
I know people kick and scream about it, but since the start they've mastered how to make it the most time consuming while simultaneously being really really fun. I've tried a bunch of other MMO's and find them to fall really flat either because they're emulating what WoW does and doing a worst job, or trying too hard NOT to be WoW and failing as a game because of it.
I've only heard negative things abotu ESO. Which is a drag, I really wanted it to be amazing. I'd still try it if people can convince me it's great, I'm a sucker. A friend got me to try both FFXI and FFXIV (and man did I hate both).