I won't light the match. :) Oddly some anti-depressants aren't significantly better than placebo, but they come with bonus side-effects.
http://www.webmd.com/mental-health/news/20080227/antidepress... Somewhere I erroneously heard that prescription of placebo wasn't allowed in the US, but it seems that many doctors use it: http://health.usnews.com/usnews/health/healthday/080103/almo...
We're just getting started on a scientific understanding of mental health. The dark ages of mental health treatment weren't 300 years ago, 200 years ago or even 100 years ago; they were the decades between the rise of surgery and sulfa drugs and the discovery of thorazine (1930-1953). fMRI and the like have been really helpful in figuring out what, exactly, drugs do to the brain, but even then, it's a pretty pragmatic field. http://upload.wikimedia.org/wikipedia/commons/c/c2/Thorazine...