What annoys me?
People who are bad at dungeons and raids, so that I have to PL them sometimes for the whole group.
It's so awesome, people who don't meld their gear, slack in AoE and don't do Dps. What a waste of time.
You don't know how to play, at least try to learn how to play.
If I have the time, I'd rather quit, it's unbearable.
Except for the learning part of the mechanics.
How can some people die so much on relatively simple alliance raids?
There are also the famous group farm Ex where the group that created it is not even able to follow the basic mechanics and claim to be a group farm... Who in doubt could take advantage of a PL.
There are also group farms that will have tagged you at your first mistake before disbanding the group.
There are also the panic tanks in raids that kill you because they run around like chickens with their tank buster.
