I've been tanking as feral from 60 raids till 70 raids and heroics etc.. and i would say that my DK are easier to keep agro with then the druid tbh. So that should give an idea on how it would be vs a pally. A DK is the only other then pally tank that agro thrugh aoe mainly so they should have sorta the same valuse as a boxing tank. And i belive that blizz basicly have made all tanks in the same way. They should all be able to keep agro good enough if played right and geared right. I see alot of "how is the DK as a tank" worryed ppl on the forum.. but the DK is really really okay.. maybe even the best one

BTW: for Nexus. .if you start it by going left with the Mage boss as nr 1 it will be easier in my eyes.. and on the mage boss. Just pop fire elementals and heroisem on max range and go insane nukings from the sec you pull here, by that i meen, that you start the pull with 100x lightening bolts . You dont need to tank here. Just go Blood presence and nuke with your DK. The point is to nuke so fast and hard that she will be spliting into 3 before she start throwing you around. At 50%to30% hp she go 3x, just heal up max and take it easy.. they are not really hard. you just had some unluck there.. Nuke them down and continue on the boss. If she should at some point throw you arond then just spam shocks at that time and hit with DK, he will hit each time he passes here in center.