Cakebatter
All Star
I always recommend people watch one of the more serious animated Batman movies before popping on Harley Quinn. You'll laugh that much harder.
Yeah, the show started to fall off when the focus became Harley and Ivy's relationship. Not as funny.IGN complained that the original main cast is now too fractured. They said Clayface is barely around. Much more focus on the Bat family (not Batman though) and no Catwoman either.