But whose fault it is when a PUG fails?
My oppinion:
Everybodys!
the easiest thing to do is to blame the 13 yr old kid, or blame the one that pulled that extra group, and call him names like NOOB and put him on the ignore list so he cant reply to you.
But we all know thats wrong. All who dont agree with that are in denial!
Why exactly is it your fault?
You simply didnt do enough to add to the team.
You expect too much.
Not that you shouldnt expect anything, but you should expect failure as well as success. You just have to be real and be aware that a PUG will never ever do as well as an organized team. Ever!
Lack of organization.
But even a PUG can be an organized team. You remember that other players are human, right? Talk to them! Spare 1 minute and discuss strategies, usefull builds, favorite ice cream flavours, BEFORE you enter the destination area.
Lack of leadership.
So youre all running arround, everybody just doing their thing, and it doesnt look good? Dont ragequit! Take initiative instead.
Humans are pack animals! What i mean by that is that they will follow the person they percieve as the most able and knowlegable one, or at least, more so than themselves. Use this! Guide the team to success if noone else wont.
Last but not least, too little communication.
You know that when you smile to people, you will get a smile back? Its true

Same goes for talking. Unless someone is really pi$$ed at you, which people in a PUG have no reason to be.
So takl! Say woohoo and gg when youre done with a group of mobs. Give the monk a kiss for a good job. Tell the female mesmer shes hawt. Do your part to make others feel they are in a team. Believe me, they will respond, and it will be fun and the way it was intended to be in a MMO. And if you fail at the mission, you still had fun!
There. I had to say that. Tho it doesnt really look like what it looked in my head, but its all there. Sorry if its long.

Just my oppinion.