I don't understand the arguments in this thread - I post a couple of times that "actually, it's a minimal DPS loss, never mind - we're still competitive" and nobody takes a blind bit of notice. People continue to argue top-ranking parses, BiS sims and post that the sky is falling because we've lost 1/3 of UM's strength bonus. Seriously?
^^ At least someone gets it. These comments about "scumbagging DPS" when you're actually just playing to unholy's strengths and spreading diseases to adds that, under normal circumstances you kill anyway is NOT cheesing meters. Diseasing a spare head on Megeara? Cheesing. Diseasing bats on Tortos if your raid group don't actually kill them? Cheesing (unless you're chillblaining or w/e) but the fact of the matter is Unholy isn't competitive this tier just because of the spec, it's competitive because encounter mechanics allow it to be. Spreading strong diseases to adds that go out of (what would be) frost's cleave range (council, for example) or turn invisible/fly away (Twins, Iron Qon) is one of unholy's main strengths and there isn't a "health reset" type protectors fight so all of that is OK.
Another thing that annoys me. Festerblight, i.e. the practise of getting maximum-powaaah diseases off at the start of the fight and rolling them for the duration IS a new thing. However, under normal circumstances for 90% of DKs that can't just have raid tactics moulded around them, it's not overly realistic to expect to use the "festerblight" playstyle on a lot of encounters. In this instance you're re-applying diseases with outbreak when you have trinket procs etc and keeping to a relatively normal unholy rotation, potentially extending diseases until your next feather proc... This is NOT festerblight, good DKs have been applying buffed diseases since DS.
Additionally, festerblight was still better without tricks and this "reforge/regem for the highest possible festerblight rotation" stuff seems inconsequential seeing as the actual stat priorities were basically the same as traditional unholy.
As it stands, yes this is a nerf to standard unholy... Not just festerblight, but that's OK, go about your lives, all specs are competitive as they have been this entire tier, and last.