Healing has been nerfed across the board, not just for Merc's. I don't know much about how PT DPS looks as I'm a pyro Merc (and I can't get those amazing 500k numbers) but I think I had one match where I didn't break at least 300k+ and that was because I stayed on defense for the civil war. All the posts I've seen about BH's crying that their DMG was getting nerfed must have been all the no talent TM spammers that can only spam 3 now before they overheat.

Pyro Merc half BM and still sitting around the top of the dps charts without DFA.

Maybe you should learn how to play your class, yes they nerfed Death from Above and a few minor other things but, yep, still doing 400k dmg in WZ's sooo....