So you are just contentedly fighting your mob/world boss/enemy/whatever you call it and some random player just comes up and starts fighting the mob with you. Does it bother you or are you grateful for the help?
I don't ask this because I'm bothered by it....usually I am extremely grateful for the help. I ask because if I see a fight, I'll usually try to help in some way. No one has ever said anything to me about it, but I've often wondered if my doing that annoys people. My main is a Templar so sometimes I'll just stand there and heal. Other times I jump into the fight feet first.