I have to agree. Bane's actions in the comics was impressive, but his motives was weak. The guy had dreams about a bat, so he decided to rule Gotham and defeat "Batman" because of fate. That's like having Venom be Australian and deciding to rule New York and defeat Spiderman because of his arachnophobia.
That's not really all that Bane is about in the comics. That's part of his origin, but that's hardly his entire reason for being, even just in KNIGHTFALL.