Don't get me wrong. I like a lot of the "Batman" episodes that aired on FOX (when the show was under the title "Batman: The Animated Series"). It's just that the animation in these late '90s installments are better. Since Warner Brothers owns Batman, I like the fact that they could finally have more creative freedom on the WB network than what they had on FOX.
For example, when the show moved to WB, we finally got to see the pyromaniac Firefly (Unfortunately, he wasn't allowed appear on B:TAS while the show was running on FOX). He appeared in only two episodes ("Torch Song" and "Legends of the Dark Knight"), and should have been featured more often like many other Bat-villains (Joker, Two-Face, Penguin, Catwoman, etc.). I would also have liked to see Firefly take on Mr. Freeze (in a "fire and ice" conflict). That would have been a clever face-off, don't you think?