I love the Dark Knight, but as a trilogy, he fucked himself from the word go. I'm not keen on Ra's Al Ghul despite being quite a fan of Batman, and while I enjoy the hell out of Scarecrow, they should NOT have taken from Knightfall if Bane was going to be in the third film.
Aside from a scene in TDK, Scarecrow doesn't come back. They don't lean into the horror elements enough. They tried doing too much in too little time in the first and third films. Where the fuck is Azrael with the bad ass metal Batman suit? Why does Bane just sort of vaguely taunt and terrorize people like a bully with no purpose or anything to do? It's like they didn't plan anything out, went "we gotta get the cover everyone remembers to be a part of the third one!" And then had zero ideas after.
I love Bane in the comics, but his character outside of that space has been mismanaged every single time.