Eh, here goes:

In my opinion, the whole attitude to this kind of fail is what kills a lot of runs. Screaming 'advice' at someone in a very derogatory way is the fastest way to make someone ignore you and plow through like an idiot anyway because they don't wanna exit and wait 30 mins to join the queue again. My advice would be, from a newer player's point of view, tell them straight, tell them simply but don't be a....*whistles*

For anyone, like me, who is less experienced: learning to take criticism before you give it is a big one. No one likes to be wrong....however, chances are if you're new...dude, you're doing something wrong at some point lol. I'm varying rotations, asking advice from other players and watching guides to attempt to suck less lol.

I think attitude is a massive part of any class's performance. Keep an open mind on both sides and try not to be a **** to your fellow players. That's my take on the subject, DPS or otherwise.