I've been playing a Blood DK Tank since Ulduar, and I can tell you that since 4.01 diseaseless IS the way to go in nearly every situation. We did some tests on http://pwnwear.com/forum/diseaseless-blood-t710.html and found that DKs in identical gear were doing almost identical threat/damage on tank and spank bosses, the only appreciable difference was that diseaseless rotations gained an early threat lead vs disease based rotations. And to be totally honest, it's those first few seconds that matter the most (threat wise).
Currently I just use DT, HS over and over. RS when it lights up and DC when I hit 100 RP.
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