The Righteous Gemstones.

I started watching expecting to see Christian evangelicals portrayed as the ghouls they are. Instead, it was just a generic sitcom about a relatively wealthy dysfunctional family. They could have been in oil or real estate or finance or TV stars and the show, at least the first season and a half that I watched, would not have been any different.

Lil Dicky is another one. I liked his comedy rap and was excited to see that sort of character fleshed out in a TV show, but in practice it seemed like they just took a generic pre-written sitcom about a hapless dude trying to balance his relationships and slapped a Lil Dicky sticker on it.