As far as MD's are concerned, you're pushing on an open door mate. And I doubt there is a single oncologist who isn't a quack. When you have a healthcare system driven by insurance, quackery is practically a guaranteed result. We have salaried GP's over here, so we are slightly better served in that respect.
As for H Clark, I know she has her supporters. I'm not one of them. My research to date places her firmly in quack camp. If further research proves me wrong, I'll stand corrected, and I'll be more than happy to revise my opinion of her.
On a more general point, the altmed community has its own quacks, and some of them can even be found on this forum. The trick is in identifying them for what they are, and avoiding them like the plague.