I can take the server issues. I got to 15 with 3 different classes between P4 and EA. Did it suck that I couldn't log in and play as much as I wanted? Sure. Like a lot of people here, I can deal with it.
What annoys me are the little things. Being able to do a quest and then not being able to turn in the quest until a certain level is one of the dumbest things I have ever encountered in an MMO. That and my wife stopping at every fucking body of water to fish. I will admit that fishing is fun, but sometimes I would like to pass over a bridge to go complete a hunting log and not stop and fish. Is that too much to ask???