Playing a Tank on Lordaeron has become increasingly frustrating over the last week because there seems to be a trend of big-peepee DPS or even healers deliberately pulling extra crap when the Tank engages a fight, even if they themselves made a large pull. Maybe it's haughty and pompous on my part, but I am, and always have been since the days of live, a "you pull it, you tank it" kind of Tank, and I steadfastly hold to the ideal that it's the Tanks job, and the Tanks job ALONE, to dictate the pace of a dungeon, assess and make pulls based on what the Tank feels comfortable that he, and his group, can handle.
So now, when I get a group that has an aggro-happy DPS or healer making things more chaotic then they need to be, I give them a warning. If it continues, I either bubble and let the mob eat them alive, or if they can handle it, I just ignore them and go pull the next group of enemies while they're busy scrambling so I can get the dungeon finished faster and get to the next one. If someone happens to die, don't care, there's a lesson to be learned.
Again, maybe it's kind of a butt thing to do, but so is pulling without the Tanks permission or knowledge and making their job harder than it needs to be. Tanking is already a thankless job that carries a lot of blame when it goes wrong, so you trying to do their job for them is not appreciated, especially if the group is already doing well and doesn't need to speed things up. Don't be one of those huntard DPS's that can't exercise a little patience. Best case scenario is you annoy the tank, they leave, and you sit in queue for an hour waiting for another one to continue. Worst case scenario, the group wipes and disbands, and everyone is left with no emblems and a repair bill after the fact.
If you want them to make bigger pulls or speed things up, let them know, but stop trying to interfere with the Tanks job and let them do what they're supposed to be doing.