I’m going to indulge my inner fanboy and note that the Flash/Luthor-Brainiac battle in "Divided We Fall", the latest pisode of Justice League Unlimited was really, really well done. One of the best representations of the Flash’s superhuman speed that I’ve ever seen.
I was initially skeptical, but this whole 4-part story arc has been great. While each episode has obviously led into the next (with some nice cliffhangers) they’ve kept up the pace and avoided the unforgivable sin of jamming all the good stuff into the final show.
The creators have also been ingenious at adapting both mainstream DC Universe continuity and various Elseworld stories, without simply replaying the same plots in animated form. It’s nice to watch a cartoon series where the writers respect the material and don’t skimp on the presentation. I wish Marvel would get their act together and follow DC’s example.