Having played MMOs for 13 years, my patience for idiot players is exhausted. I can usually tell right away if a PUG player will be a problem based on their attitude. If they rush, blame others, don't do their jobs and won't listen I don't need more than a couple of encounters to know its a lost cause. If they are inquisitive however, ask for advice or are open to suggestion, I will stick around and help...mostly because if I'm ever in a new dungeon I hope someone with more experience there will do the same for me.