That Batman series from 2004 was okay from what I saw of it though still putting Paul Dini's Batman series, though after seeing a few of the new Batman Brave & Bold, I'd gladly embrace the 2004 series as the stuff I saw on Brave & Bold was rather stupid (in writing & how the characters looked).
Personally, I found the show enjoyable, while it lasted. Joker had some funny episodes, and Penguin simply cannot be any more HILARIOUS!
However, I myself didn't care much for the final season; too much teaming-up with a not-so-subtly all-male Justice League (the show's called THE BATMAN people!), rather than the simplicities of just Batman, with Batgirl and Robin, against just-as fun Batvillain of the episode.