The only thing that drives me insane on runs while I'm tanking are the DPS that just ignore marks. 3 mobs, mark them 1, 2, and unmarked....unmarked starts going down first. Ask the dps to please follow the order of marked targets only to have a snide reply or be totally ignored. Sometimes, and my personal favorite, is when they use the auto translate to feign language barriers yet they're marked English speaking on their character search.

On top of your great guidelines to starting people out on their tanking journey it would also be good to remind future tanks to be patient and remember that there are people out there that do things just to give others a hard time, just as well as there are those out there that can't follow directions or roles if it were to save their own life.