I will leave a group if I come in and the tank or healer are severely undergeared. idk how many times I entered neverreap and the tank was in mostly lvl 55 gear. And there is a really disturbing trend of tanks just focusing on one mob and letting the rest eat the party without even a flash or any effort to be seen. And yes I am a smn, aoe is my bread and butter. I can take it easy of course but do not expect me not to bane.
There is a point where it is just ridiculous for someone to expect you to take an extra 30 minutes in a dungeon because they can't even be bothered to buy anything better off the mb. I would rather spend that 30 minutes in my lockout getting other things done, crafting, maps, gathering, etc. and requeue later and get a group that comes at least somewhat prepared.