In low level dungeons where keeping aggro is harder due to lack of abilities or I'm leveling and someone is level synced, yes, I mark. If someone keeps pulling hate due to not paying attention, I will attempt to pull back a mob a couple times and will let them keep it after that.

In max level dungeons, I don't mark. DPS gonna aoe anyways. At this point, a tank should be able to keep group hate.

Other than that, if you don't want to put up with annoying random players in the DF, go with friends. :/
Also, you're preaching to the choir. The folks that take the time to actually read the game forums are usually the ones smart enough to know how dungeons work. ><