Did you leave your old game because one was shiny and new, or because you'd already completed all the content for your current patch/expansion (or at least, all you had access to)?
Did you leave because of class/abilities/content nerfs, or because these features affected the way you grinded?
Face it, the grind is the most important part of an MMO. An open world, leveless game with completely balanced skills/classes and no artificial "skill ups" (i.e. the game says your accuracy increased as opposed to having learned when and how to release an arrow to hit a moving target) may seem perfect, but how long would you play it? One may point to Second Life, but few people consider it an MMO, not just because it lacks content, but because it lacks a grind. The high amount of customization also makes it so players can potentially create anything they want. If this occured in, say, World of Warcraft, why would people raid when they could make better gear?
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