Originally Posted by
bigdawg78
Well it could be lag or a variety of other things, but I'm going to take a stab at this. First off, your talents look pretty good. Not taking 2/2 dirge sucks, and you may want to ditch Master of Ghouls and 1 point from Bladed Armor to pick it up. More runic power = more rune strikes, death coils, unholy blight, etc. Make sure you macro rune strike to every single ability in your rotation. You want it going off as much as possible.
You could also take a look at the tank excel sheet over on elitist jerks. You plug in your gear and talents and it will try to give you the best rotation for threat. I was surprised when I did mine to see that unholy gave me lower single target threat than Frost. I thought unholy was better at mitigation and threat. The AoE threat (sleeper threat) of unholy is nice, but a nice deathchill -> howling blast works wonders as frost. When I plugged in everything in the tank sheet for me, it gave me under ideal conditions, fully buffed, about 4.5k TPS as unholy and about 5.5k TPS as frost.
But I suspect the problem is a lot bigger than just the spec. Is there another unholy DK in your raid currently? If so, him being there will gimp your dps since his ebon plaguebringer disease will overwrite yours.