Have to sadly agree with a lot of post around here.
When the series was announced as being more “adult,” I was hoping for more than just a (often) superficial addition of violence, anticipating more complex storylines. But the series offered neither, and that's precisely where it disappoints me the most : without necessarily wanting to compare it to BTAS, the writing simply lacks ingenuity.
There’s interesting reinvention but their actual use seems very timid. Oswalda's sons are ultimately treated as disposable henchmen, Harley is a deviant psychiatrist but somehow just sends dumb muscle at Batman, Flass seems to use Bullock and pushes him to get his hands dirty, but in the end the duo didn't explode, there are no interesting little finds around the Onomatopea gimmick...
Despite all the freedom promised, each viewing actually gives me the opposite impression of a rather rigid and sometimes superficial writing, and a series that ends up missing the mark of its noir intentions.
Visually, I really like the art direction (the background paintings are beautiful) but in terms of actual animation, you can really feel the budget constraints. Despite that, I still think things could have been better, if the characters—even with limited movement— have had better posing and benefited from a more sophisticated lighting.
Online, you can find quite a lot of concept art for the characters and even some storyboards, and it's heartbreaking to see how these drawings, yet static, have more energy than the final product.
I still enjoy the series, because Batman paired with Bruce Timm's style of art holds a special place in my heart. But to be completely honest, that enjoyment stems more from what it could have been (or will become) than what it actually is. I remain hopeful that the second season will find its footing.
Ironically enough, after what I said about the writing, the very simple short film “Strange Days”, which partially inspired the series, seems superior in every way. And since my favorite episodes are the ones featuring Clayface, Gentleman Ghost, and Natalia Knight—and knowing that there's a sort of consensus on this—I wonder if the series shouldn't lean more toward this kind of pulp horror rather than crime drama...