Yesterday I did AK with a tank that was new (and forgot to equip his high level weapon, which he seems to have left on the retainer so he had a level 36 weapon equipped >_> )
We all knew the tank was new and I said that even though he was lacking in the gear department I'd still give it a try.
We explained everything to him on every boss and even joked around with eachother.
Wiped a few times but it didn't really matter.
We finished the run with about 15 minutes remaining (so we spent 105 minutes doing the dungeon).
I had fun even though the fact that it took so long. Yes we wiped a couple of times and yes it took forever but it was 1 of those runs where I had the pleasure of playing with other players that seemed to enjoy it as much as I did.

@OP: Sorry to read that your experience was ruined
Do remember though that there are plenty of easy-going players out there.

(1000 characters on a forum is ridiculously low had a lot more to say)