It's not really about who's paying for the show, but actual show creators, the people in less glamorous jobs such as editors, scriptwriters, casting directors, and producers. I whole heartily agree that much improvement could be done there.
Netflix did spectacular jobs with many original TV series and so did Amazon. In the same spirit HBO, Showtime had their own share of misfires -
Angry Boys, Ja'mie: Private School Girl, John from Cincinnati just to name a few "crown jewels" from HBO
and from Cinemax:
Roadies,
Happyish,
White Famous, Dice