Tanks doing huge pulls typically doesn't bother me personally but that's because I can handle almost anything in DF dungeons. Sure a heads up is nice but by the time they run up to the 4th trash pack and then keep going I'm already like "Oh you're one of those. Ok." Cleric stance comes down and swift cast cure II and Bene and tetra are all prepared for the inevitable cure bomb they will need when they stop running. What does bother me is those "special" tanks that pull more than they could handle even if they had a whole party of healers, who then rant about how horrible the healer is when they die.