Drs. Cifu and Prasad have done research on what they call medical reversal (when a particular therapy is found to be worse than the previous therapy or does nothing at all) and have concluded that the rate of reversal is 35-40%. So your doctor isn't doing fantastically in actual medical therapies either.

http://www.econtalk.org/archives/2016/02/adam_cifu_on_en.htm...