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Umm...pretty sure DnD puts out the highest threat over any other multi-rune skill provided the mob stays in the DnD for the entire duration, which happens most frequently on...Bosses.
There's a perfectly fine rotation for including DnD in your rotation which starts off pretty slow, but works just fine once it gets going.
There is ABSOLUTELY no reason to be using DnD on a boss. If you cannot maintain single-target aggro, you should learn how to play your class. DnD has a 1.9% Threat modifier on damage (lower than Rune Strike). At 2000 AP, your DnD will tick at something like 145 damage.
So, you just wasted 3 runes for about 2.4K in threat. My Oblits alone do more than that, without even bothering to factor in BS. And with DnD, I don't get a Death Rune for another one the next time around (it costs TWO Oblits, not one).
NEVER use it with single target tanking unless, for some reason, you cannot get into range for Oblit. And, even then, HB does more than 3K+ for me in crappy gear and a KM proc.
And, like you said, DnD only works in the AoE. Good luck explaining to your healers that you couldn't save them because you decided you only wanted to have hate in that little circle, rather than hitting the boss hard with two abilities, so you couldn't get snap aggro back because he resisted your Dark Command (are you hit capped as a tank? Probably not)?
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And I get to Rune Strike the most with Blood spec, simply because my rune dump skills are either crappy (Death Coil) or on a CD (DRM). While in Frost I have to work FS in there too (because I am not at 100% avoidance). Just because you get an extra 3% dodge in Frost doesn't mean you'll be RS-ing more often. You aren't at infinite RP.
Fair, but RS takes priority regardless in Frost. You don't HAVE to work in FS--you do it if you don't have a RS proc, are at that point in your rotation, and have the RP. (If you have 60 RP at that point, you generally still do it).
It is the same thing with DC. You don't HAVE to use it, but you might as well if you are working up a lot of extra RP. Your DCs should do around 900 damage (which isn't nearly as good as FS, undoubtedly), but is only meant for those times you have the ability as Blood. And, with Sudden Death, you will often have a crit proc here.
FS IS better, no argument. But that doesn't mean DC SHOULDN'T be in your rotation. If you don't want it, you don't want it. But, you sound like you are the person that would take Morbidity, so that is 15% damage to it...
Just saying.
Edited, Apr 13th 2009 9:18am by idiggory