I got a little exasperated with how surreal, meta, and masturbatory this show got at times with its excessive pandering to comic book fans. Particularly in episodes like "Emperor Joker" and the finale. I'm not a big fan of episodes like those with their 'no rules, anything goes' approach to storytelling. I prefer more straightforward, old school storytelling, but the series had a good amount of episodes with that too. That was one of its strengths. Even though it went a little overboard with the comic-referencing wankery sometimes, it also offered a little something for everyone.
Personally I preferred the episodes with fairly simple stories that got their novelty by doing unexpected things with character dynamics. For example, the change to the Red Hood character in the Owlman 2 parter, the unique villain and hero pairings in "Triumverate of Terror", the anti-hero treatment of Batwoman in "The Criss-Cross Conspiracy", The Joker's chance to have an episode told from his perspective in "The Vile and the Villainous", and the old Justice League vs. new Justice League feud in "22300 Miles Above the Earth". The first Batmite episode was really fun too...I just found its sequels tiresomely whacked out.
I have mixed feelings about this show, but overall I think it's the first Batman series after "Batman: The Animated Series" that was truly special and a worthy successor. I think in a lot of ways, it was what "The Batman" should have been. "The Batman" came off as too much of an inferior "Batman: The Animated Series" rip-off. This one found its own path and while it overdid things a bit at times, when it worked, it was brilliant in its own unique way. It was finally the show that demonstrated Batman can be fun without being completely ridiculous (like the '60s series, which I like, but have no desire to see in animated form). The show's ability to be wacky all the time, yet still present a Batman who can actually be taken seriously was an impressive feat.