Re: Should the new Batman movies go fantastical?
I say embrace the fantastic and add a touch of plausibility. My favorite example for this one is Poison Ivy. Make her the head of a South American drug cartel that experiments on some kind of mutagenic plant virus thing. She can use it to create plant-human hybrids that can disguise themselves as humans. These are her heavies, the muscle she uses to get a foot in the door in Gotham's drug trade. She can be developing plant toxin based bioweapons on the side, using her drug trade to fund the research. There, you've got something very science fiction-y blended with something that's more realistic. Take this principle and apply it to Batman's more fantastic rogues.
"I never asked for this crown. Gold is cold and heavy on the head, but so long as I am the king, I have a duty … If I must sacrifice one child to the flames to save a million from the dark … Sacrifice … is never easy, Davos. Or it is no true sacrifice." - Stannis Baratheon