Is unholy PvP dead?

Since the release of 4.1 I've been playing desecration frost spec and recently opened my unholy spec back again for 2's. I found that even with ghoul and better diseases it neither seems to have better control than frost or the amount of pressure and really the only pros to unholy that I can see for the time being is DA, perma ghoul, and gargoyle. My rotation I use for Unholy would be Outbreak>CoI> D&D> FS> Death coil dump>necrotic when it comes up> FS. and then gargoyle and dark transformation when available. If anyone could point out what I'm doing wrong or affirm Frost has just become the most viable PvP spec for a dk for the time being would be very appreciated