The worst thing about this show is that it is not absolutely terrible. It is sometimes pretty good.

If it sucked, then it might get cancelled and we could all stop watching. Instead this show is a stark blend of good and bad elements.
It has some pretty decent noir detective style stories, where the main character, Gordon, is the only honest cop in a totally corrupt town. Then a guy called Penguin eats sandwiches after he randomly stabs people. Gordon is a cop so committed to doing the right thing he will literally sort through the shit to find the truth (evidence in the sewer). But later a guy asks a bunch of Riddles and everyone says he Riddles too much.
The other main cop, Bullock, is an interesting mix of corrupt cop but still has decent sense of justice. Then a young rich orphan is sad a bunch, while people tell him he will do great things one day (that we will never see).

Even though the "Gordon cleans up police alone" is the best part of the show it also has contradictions, for instance there is already another whole department of honest cops. And he also has a super successful, rich, and supportive fiancé who could completely take care of him if he quit being a cop. So he isn't really struggling with his life in any way. It makes him copping about look more like a whimsey, as opposed to a duty.

This show has a pretty decent core narrative, it's all the auxiliary stuff dragging it down. It also does a good job of not being entirely episodic. Often minor plot points from previous episodes will impact the next one.

For a show based on Batman, the worst parts of the show are the Batman bits. Like when young Bruce Wayne, or Selina Kyle ("Cat"), or the Penguin or the Riddler show up. If they cut out all the Batman things in this show, it would be much better.

I want to either love this show, or stop watching. But I can't do either. Instead I keep watching a mediocre series and hoping it improves.