Basically the Timmverse in general is as good as it gets
I realize that the majority of the world would think that the Nolan films are in general "better" pieces of art than BTAS. But I love BTAS so much more than I love the Nolan films. To me, it's the definitive Batman experience, and is almost impossible to top.
I watch the DCAU religiously. Lol it's gotten to the point where i watch at least an episode every day, i'm surprised i'm not tired of it yet...
I just got started on
Spider-Man The Animated Series, and coming from a die hard DCAU fan, the switch was pretty easy to make from the DCAU to S-M:TAS. The quality is pretty much the same. Spider-Man TAS is an amazing show, and if you're a big fan of the Timmverse you will love it!!! Same with X-Men TAS, but I gotta say i prefer Spider Man TAS. Anyways...yeah back to Batman and Superman! Sorry!