I think that it very much depends on the individual and the med and what else is going on. Obviously doctors and patients do need to be responsible.

For me the meds I am currently on make me feel great. They haven't cured me, but they have allowed me to experience what it is like to be ok, which was a huge help as I had given up all hope of that. Duloxetine, however, really was just like a chemical frontal lobotomy and seriously got in the way of therapy. Back on my original meds now and already starting to have emotions again.

That said, I can see situations where drugs that have this effect can be useful to patients who need a period of respite from extreme pain. Sadly some people need that their entire lives just to survive and the best that can be hoped for is a limited functionality because that is better than the alternative.