I think this article puts psychiatry's dilemma into some good perspective: http://www.sciencebasedmedicine.org/dsm-5-and-the-fight-for-...
I do think that it's interesting how people conceive of psychiatry. We cannot really objectively measure or test pain. There's no blood test or scan that confirms it. But as everyone has experienced it, nobody doubts it exists. There's migraine headaches, which are, like psychiatric illness, diagnosed based on history and symptoms. It's pretty uncontroversial. Yet, as everyone believes themselves to be an expert in behavior, if they have not experienced or known someone with mental illness, it's suddenly all invented.