This is from another thread about tanking looking intimidating: (I made the bold and italics)

Quote Originally Posted by Ed_N_Ants View Post
You honestly need to learn the role... I personally as a dps and healer pull mobs in lower dungeons to see how the tank handles agro... If they can get it back from me I know they know what there doing and say nothing... If they don't get it back from me I educate them on what needs to be done... Ask your dps if they can pull the mobs cause you want to test your skills... This game and its jobs are learning experiences only... As long as you can hold agro thats 95% of your job the other 5% is dodging aoe's and knowing where to tank the enemy at, which can easily be achieved by telling a group your a new tank to the trial/dungeon... Most people will help you out...
This seems like an off-hand comment and remark, and the intention is actually good, but I disagree with it and the methodology in full.

By the logic, this person is saying that they will do the tank's job and see if the tank can take it back - or do something wrong and see if the tank will fix it. Using the same example but reversed, an experienced tank should then stay in AoEs and not dodge magic attacks that can be dodged, or not use CDs that should be used, to see if the healer can keep him healed.

This is also a reason I mark targets: the party is a team when going into a zone - dungeon or raid. Tank is like the QB, calls the play, and everyone goes at it in a coordinated effort. You target the mobs for ease of efficiency in knowing which one to focus on.