It's a high skill cap class. Highly skilled unholy DKs have no problems soloing healers with extra abilities to ignore CC. As I said previously the combo was played successfully at high ratings and could be here.
PS. I've seen one or two unholys that play like a boss and own warriors assuming no latency issues, but they are not so high in number. They likely can beat hunters often enough as well assuming the hunter doesn't start out at max range.
And...your statement about X number of Retribution in top 100 was flubbed. There is exactly 1 DK and 1 Ret in the top 50 and no else in the top 100. The rest of the Paladins are geared for Holy spec.
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