Well, you're most likely not wearing rare PvP gear with an ilvl450 rare 2900 DPS weapon, with DPS stats reforged to mastery or dodge where available, and with almost every gem either mastery or stamina. It would seem I'm around 25K DPS or so, according to Skada, and that's to a 85 dummy, since in Orgrimmar it seems to be impossible to fight a raid boss dummy without HS hitting another target.
I'm not sure if switching my enchants and reforges to DPS would get me to the required 37K DPS, even with Vengeance factored in, but I'm not switching anything as long as I'm doing random battlegrounds for conquest points as blood. I'd much rather be immortal against 3-4 guys while I'm still getting conquest for my axe.
As I said, if you're similarly geared, I think Patchwerk might be a bit too tough a cookie. Not sure.
Here are some images as reference. These are my stats with only Horn on: