As someone who has mained a tank I've never gone straight to big pulls unless the group asked me to. I don't like to assume others are on board for it and I try to minimize the stress level I'm adding for the healer. Plus I'm still working on mastering my tank so I try to keep the mobs easily manageable for myself. I know I represent a very small population of tanks but this is also the first mmo that I've been so involved in doing dungeons with.