Here are my 3 rules to tanking.

1. Never pull with regen. If the healer tosses it on you.. right click the icon to take It off and pull. Be sure to vocalize to the healer why you don't want regen at the pull. Don't expect them to know.

2. If the DD wont kill mobs in the order you have them marked, let them tank. After a couple deaths they will figure it out or leave.

3. WE are the leaders of the group and WE set the pace. If someone else wants to set the pace then tell them to roll a tank and boogie on to another insta-queue.

Most importantly though. Be vocal at the start of any dungeon and set expectations. If no one can follow through on these couple of things then move on to another group. Its as simple as that.