i always found it funny how me and my tank friend on our DKs can almost duo all the heroic guys all by ourselves.
heres a story from me...
we were on a group for heroic Halls of lightning and were started on volkan.
he was half way thrue when he cast his golem shatterring thing, the healer, and the other two DPS didn't listen when we told them to go away from the golems. they all died instantly. our fault we thought we'd be fine with little guys not geared. and so we try our best me (blood DPS) and him (Frost/Blood Tank) are at about 50% of his life and we're still bashing our lives into him. then he cast his shattering again, we dodge it, and then 15 second after that he goes down. we are like at 20-30% of our lives and the other 3 are like congrating us.
can you say RuneTap + Imp RuneTap + Glyph over powered, i think yes... he has it on his tank. seriously it was madness we litterally could have taken him down just the two of us in heroic mode.
tank wise i think nothing beats knowledge, even if you haven't done anything, if you already know what to do, its 2/3rd of the fight won ! unfrtunately some tanks dont know how to take aggro and not lose it which is hard for a DK since D&D is pratically unbeatable aggro wise.
i also agree on natural here, now a days people wants fast run and ar elike unstopable, even aggroing mobs themselves in order to make the group go faster.
which reminds me of this story...
My friend DK is tanking, i am an healer, my other 2 friend DPS, and one random dude wants to go fast fast fast, he jumps in and die, while we were all sitting and chatting together on vent. he had been doing that for like all the dungeon, we were at boss and all decided to let him be killed to teach him a lesson !
man was he pissed ! =8-D