There's nothing wrong with changes to a character. Some changes make a characterisation better. It's just dumb changes that I have a problem with. Changes made for the sake of it. Or ones that detract from the character, instead of adding to it. Like making Bruce Wayne a sex and alcohol addict to deal with his pain - when, you know, that's the main reason he is Batman. Or killing Dick Grayson for no good reason. Or letting Wayne manor go to wrack and ruin, despite the fact that one of the central elements of Bruce Wayne's character is maintaining the façade of a billionaire playboy with a huge mansion, so people don't suspect he's Batman.
So, this isn't about having a Batman Number One fan badge, it's about be able to critique poor decisions and concepts because they detract from a character. And if you're a Batman fan, I fail to see how you can be happy with such strange and sweeping changes that do nothing to make the characterisation better. I'm a Nolan fan, but I know damn well that he made some silly errors in TDKR.