The writing can be a little hack, but clearly the animators put a lot of work in. The whole creepy art-deco design of Gotham is really good. Plus there’s lot of cool effects, like Two-Face’s other face being shown in lighting.
I’ve been giving it a re-watch and have been surprised at how good it is.
As much as the art change in season 3 was a huge downgrade from season 1 and 2. I still like the Dark Knight Returns parody episode.