You're right, I can definitely see that, and I can see how it casts Bane in a completely different light, too. I'd never really looked at in terms of Bane being more focused on Batman than his previous objective, and that makes a lot of sense. To me, though, it was all kind of overshadowed by a plot twist that felt pretty forced and un-necessary, and relied an awful lot on the audience caring about the motivations of a character who, I felt, we hadn't been given nearly enough reason to care about.
Oh God, this. One scene in which I actually laughed out loud was when Talia said "his only crime was to love", or something equally asinine. He's murdered thousands, crashed a plane, been a notorious mercenary for (presumably) some years, has been responsible for the deaths of thousands of citizens of Gotham, has caused billions of dollars worth of property damage, illegally obtained a nuclear bomb, forced a prison break, and is holding what is presumably one of the largest city's in the country hostage, plus whatever he did to get him thrown into the "hell" prison in the first place. HIS ONLY CRIME WAS LOVE! IT'S SOCIETY'S CRIME, NOT BANE'S!
Everyone's motivation in this thing was all out of wack.
While I think you're basically fair in your criticisms, that line wasn't a reference to Bane's actions in Gotham - she was telling Batman that Bane was exiled from the League when loving her was his only crime i.e. the only reason Ra's could possibly have to exile him.