how would you kill anyone without full Wrathful though? lol JK

Paladins work well because of their burst, which DK's do not share right now. I'd be curious to see any DK teams with gear and how they are doing, but I doubt as well as paladins just for the lack of heals.

Rune tap is an amazing heal every 30s though, but no single target heals which sometimes you need.

Maybe 4 DKs and a separate healer?