1. To me a good tank should be able to gauge the healers ability with the first one or two pulls. I like it better when the tank sets the pace. A good tank will ask if anyone is new to a dungeon. A good tank knows the skills they have to work with and how to use them.
  2. A good healer should be in partner with the tank, and know there is many varying playstyles. A healer could ask the party if the party is okay with bigger pulls. A good healer never jump the gun and pulls for the tank.
  3. A good group is one that has respect when a tank or anyone of the party is new and learning. If someone says they are uncomfortable with a huge pulls, then "all" in the party should respect that. Usually it would be a good idea to let the party know up front, that you are new to the dungeon. Don't queue up if you know real life is likely to get in the way for more than 5 minutes. Lastly you should use the facility "before" you queue.


This, to me, is what makes up a good group overall, not just a tank.