The worst has to be wt4. I can't tell you the number of times people just go running off and attracting more mobs. Or someone does something dumb and instead of facing a manageable size, you are overwhelmed by the sheer numbers. Then they give up and quit after they die. Also what is irritating is when you are killing yourself trying to take down some boss. And some one runs away and resets the boss more then once. I am thinking of joining a guild cause most PuGs are getting frustrating in hopes to play with some quality people.