It's not failure.
He's simply way too small and the whole "Bane, even without Venom, is still stronger than Batman in strength" canon can be thrown out the window now, because it'll never be believable that little dude with big muscles (for Hollywood) is stronger than Batman who's physically much larger than him, even if they stand his little ass on a box and film from the knees up.
i trust Nolan, because I think I remember hating the idea of Ledger as Joker, but that was kind of short lived.
He's simply way too small and the whole "Bane, even without Venom, is still stronger than Batman in strength" canon can be thrown out the window now, because it'll never be believable that little dude with big muscles (for Hollywood) is stronger than Batman who's physically much larger than him, even if they stand his little ass on a box and film from the knees up.
i trust Nolan, because I think I remember hating the idea of Ledger as Joker, but that was kind of short lived.