No, no, Joker, you see, that's not what Chris Nolan meant when he called Riddler and the most of the other Bat Rogues "Watered down Jokers".

t:
And I've apparently misinterpreted J Nolan putting Penguin and Clayface in the same category as "Sci Fi supernatural villains", even though the only thing close to sci-fi/supernatural about Penguin is his nose, which isnt sci fi OR supernatural, but even then, his nose could easily be altered for a "realistic" take, cause after all, if they can make a luchadore lookalike who pumps himself up with supersteroids to become a 7 foot monster "believable", Penguin shouldn't be a problem, at least in theory.
IMO, it would just be easier to say that they don't care for or know much about most of the Bat rogues gallery...it would also pretty much be the truth. But let me stop ranting before the nolan brigade comes in.