Unholy is absolutely fine, its in a good place right now. Frost is absolutely brainless and disgusting. Unholy has a lot more control and I expect more people to start switching to it again now that its been buffed.
I do believe that my class is in a decent place, however people have to remember that DK's do not bring anything substantial to assist their team in the way off offheals / cc / sac / freedoms. I'd recommend people to wait until the season begins to cast any serious judgements as I believe that there are comps with a lot more control that will be able to do a lot better than DK comps on the ladder.
Would have to agree with arahan, when played right, monk TSG definitely has the capability to beat RMD purely because of burst healing in the form of orbs into bomb, bubble, revival, and the amount of cc breakers the dk and warrior have to counter the RMD opener. A good TSG should be able to reverse the pressure very quickly purely due to damage, with quick swaps on an undoubtedly squishy rogue in an asphyxiate stun forcing trinket and finally killing.