Raid buffs aside, I would guess that Marrowgar, Saurfang, Festergut, Rotface, Princes (maybe, target switching is a bit rough), and BQL aren't much more friendly to Unholy than Blood. I've got comparable numbers with both. And I agree, I always used the Hysteria on myself; the feral druids and hunters I tried to help out never fared much better than the rogues.
Edit: My Arpen was around 45%, I believe