So I just started playing my Death Knight (which is my new main on returning to the game) after all the talent changes. I don't know if this has been brought up before but I'll go ahead.
From what I've read on most guides, Rolling Blood is considered pointless for PVE. Now I know as Frost, Blood Runes get converted to Death Runes so its a waste to use a Death Rune on Rolling Blood which uses a Blood Rune. However, considering Pestilence uses a Blood Rune as well for spreading our diseases, doesn't it make sense to take Rolling Blood in the first tier?
I have not tried Unholy so may not know much about it, but shouldn't the reasoning be the same?