New Death Knights and blood spec
Your problem isn't death knights in Blood spec, you problem is death knights in Blood -Presence-. It's like a ret paladin with Righteous Fury on. Or like how a bear-specced feral druid can hop into cat and dps, without too much of an issue (numbers aside), but trying to do the same thing in bear form is going to result in bad times for the group.
If you're having trouble with threat, tell them to get out of blood presence. And maybe be a little more aggressive with your AoE threat, Blood Boil's damage is obscene in Outland levels.
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