I like lesser known villains. The classic villains are great. But are very repetitive not just in animation in the comics too.
This could expand the richness of the rogues gallery. Before Mr Freeze in BTAS there was The Riddler in the 60s tv series. I believe he had only appeared in 2 issues in his 18 year history before Frank Gorshin played the role in 1966.
A similar case with Bane in the new movie. While he is used often. He will become a household name now. Its a wise choice to do similar with even lesser known characters.