Yeah Zeta is defiantly the weakest entry in the DCAU. Also don't forget about the web series, Gotham Girls and the Lobo series. The Gotham Girls series I believe was included on the dvd version of Birds of Prey. They should all be online, the same for the lobo web series.

And if you REALLY enjoy the DCAU, then the comics are worth tracking down. Especially all the ones dealing with the animated Batfamily.Although the final DCAU title ended with a large unresolved plot, the mystery of the DCAU version of the Red Hood.