I came back to WoW a few weeks ago and have been playing all the various healing classes up into the 30s and 40s. Dealing with tanks in random dungeons is like going to a really bad comedy club.
Everybody seems to be infected with the zoom zoom disease. Run fast, never look back, pull a ton of mobs and then scramble to recover from the chaos. Many low level tanks never once check to see where their group is.
I've had tanks start on bosses while I'm rezzing somebody who just died on a mega-trash pull. I've had tanks pull masses of mobs, get them mostly dead and then head off into the distance while the DPS struggles to finish with the pull.
Fast is one thing but stupid and blind is another. What ever happened to the days when a good tank was like a Shepard to the group and took pride in a clean run?