True, there are gems out there, it's just that IME they are very few and far between. Particularly when it comes to programs that take public insurance. Come to think of it though, the best mental health (their substance use disorder program was however a joke, unless you really enjoy your twelve step stuff) treatment I've ever received was through a place that took both my private and public insurance, and I didn't have to pay a cent. So there's definitely there, just not in the majority.
And true, if one needs treatment desperately places that take public insurance are definitely out there. The majority of those I've personally experienced (so 3/4) provided care that did me more harm than good.