For me it's rather the opposite. It's viable as an MMO until you hit level cap. Once you do, it's all roulettes and dailies and Tomestones. There's not enough end game and it's designed to be done ad infintum without any real worthwhile drops in any of the dungeons (a la PSO or somesuch) or any real reason to do anything other than Tomestones, which aren't any fun. The game is great up until then. After that, it's really about glamour and hanging out with friends.