"I am new" usually means "I am too lazy to do my homework before entering the instance" or "You might think that I am less skilled player, but do not worry, I am actually quite good, but you can't see it, because I am new"... I don't see the point to lower morale before the run even starts. If somebody is playing poorly, it doesn't matter if they are new or not. They are not prepared / playing poorly and forcing rest of the group to make up for their performance. Mistake is still mistake and exuces are not going to change that. The irony is that "I am new", actually may give ppl motivation to spot mistakes that wouldn't be otherwise noticed.
"Instant queues". Honestly, the hardest thing about tanking is persuading yourself that you are doing good job, while paying attention to mistakes of your "awesome" dps comrades, just in case they would start pointing out yours. Unfortunatelly, until we get at least some kind of dps meters, the tanks and healers are always going to be the primary target of blame.
