Eh, I think this is too dismissive of some pretty deep ethical and philosophical considerations. Effectively they are giving drugs that alter ones perception of reality and then judging their effectiveness on the patients perspective. But since they alter their perception of reality it's tough to rely on patient reports.
Anecdotally speaking, there's a lot of people in this world that think drugs make their lives better when an objective observer would pretty strongly disagree. That raises a lot of difficult questions. Most notably, do we give someone a drug that will make their life worse but also make them think their life is better.