Glad this topic is still kicking around.
I will add my input as i have a 3dk 2pally melee team at around 75

I started this team a while ago but stopped working them as DK was getting nerf bat every other week. The great thing about this team, and perhapes the most underestimated is the ability to pull players into you.

It works extremely well, as the second the offending person enters your mob they are almost instantly exploded. This team would work best i imagine with the right pally/dk ratio. I went for that extra pull so no one can ever escape me. Dont get me wrong I love chasing that feral around a pillar all day, but the pull lets me get more time in killing instead of playing grab-a**. Dont forget that glyph blood spec heal, it really helps in a pinch!