There is a problem with frost, not unholy.
Unholy is “fine” with the two~three pvp build variations.
What I would still change a little bit, would be the damage of the fastering strike, it is still not a very “ok” skill to use - it needed a 10% increase or a cost reduction…but otherwise, the Desease build with DnD(defile) + blight is good in pvp so far.
Other than that, I believe that one more option to choose in place of the army of death would be interesting, for example, a talent that gives a small chance to summon an undead malee from the ground. Why ? because a skill of 8 minutes CD in pvp is still surreal.
I would also put the option of unholy being able to have dual wield, instead of two handed. Why ? because it makes perfect sense to me, frost has a huge history of being two handed, unholy is a duelist / fast class because it always had this footprint of causing quick damage. This is so true that haste is needed as much as mastery, for builds like desease.
The problem is with the frost build. It has a problem with dealing damage only to exact windows. It’s easy to avoid, requires a lot of handling, and is usually way down in all situations - dmg, CD and control.
Apart from the problems with frost, I don’t understand the part about - “the problem dk has since X expansion” - that some of you are talking about here.
What I could say is that I’ve never seen pvp being worked on as much as it is currently and, that at the most there is a VISUAL problem in unholy, where some fight animations are still weird.
Those things aside, I don’t see that many problems with unholy at the moment.