Sure, but WoW's issues were primarily queues and latency due to an overwhelming surge of players that they did not expect. Their success was unprecedented after all. Their problems weren't centered around convoluted systems or a lack of intuitive gameplay. They made the game fit the player rather than the player fit the game.
Not only that, but because of the bigger budgets MMOs get these days, players are more nitpicky than ever. Take for example how I've been trying to get interest built up on the game among friends. They're already turned off due to the fact that the earlier levels have you fighting moles and rats. I'm kind of annoyed at that myself, and I realize it's part of Square Enix's hard-on for making you feel like a giant pansy when you start off so that as you progress, when you start taking out dragons, the scope of progression is that much more epic. But my friends aren't buying that. Their argument is that when say, Star Wars: TOR comes out, they won't be swinging light sabers at tiny forest creatures.
So, I dunno. *shrug*