I think that's fairly well-known at this point, though I agree it should be more widely known.
I think the real secret is that Netflix discovered that their users aren't trying to watch the best movies, they're just trying to kill time. Apparently you can substitute good films for generic junk and people will keep their subscriptions.
Really, the business model for Netflix has some weird perverse incentives. They make money from monthly subscriptions. They lose money when actually streaming content to users. So the ideal user from their standpoint is one who keeps paying but never watches anything.
Thus, the company is incentivized to put out just enough good stuff that you can't miss that you don't cancel, but otherwise produce garbage you don't want.