I've seen plenty, and share a healthy skepticism about modern medicine. BUT, even I could not let this pass.
Doctors DO have review boards, mandatory in every hospital in the country.
I agree that many state medical licensing boards are next to worthless in dealing with routine negligence cases, but that is because every doctor, every lawyer, every professional of every description, has moments of negligence, probably every day. As do we all, even when driving a car. Human error is part of the human condition, and you just can't discipline everyone for every mistake. So when people get hurt, they sue and most cases get settled. If they don't get hurt much, life goes on.