Is there adverse selection in reports of the callousness, incompetence and greed of US healthcare providers?

Three years ago, of necessity I became a big-time consumer of healthcare[1] and I can't believe I just been lucky that nearly all my doctors seemed reasonable and effectively treated me. Of the dozen or so doctors I dealt with only one left me with a bad feeling.

[1] Stage 4 renal cancer, successfully treated with immunotherapy and surgery at Perlmutter Cancer Center in NYC.