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.
The season 3 art style change was a huge downgrade but at least the writing was still good, and we got a lot of superman and supergirl crossover episodes during that season.