The domain of Dr Oz's advice is also going to be different from a lot of general practitioners. While most doctors will spend most of their time giving out standard advice for routine conditions, Dr Oz will jump on a new fad each week, because he is producing entertainment and routine is not entertaining. Dr Oz will launch a campaign about how apple juice is poison, while most doctors will be giving out advice like "Your blood pressure is too high. You should try X, Y, Z to lower it."

I wouldn't say he's a quack -- that implies incompetency. Dr. Oz is actually one of the best heart surgeons in the country, it's rather just that he sold himself for money.