I still have a hard time understanding why people think this version of Batman is "way off". I don't know, maybe it was easier for me to let go of my preconceptions about the character than it was for others, but this Batman made sense within the context of this particular movie.
Is it because he's branding criminals? Is it because he's killing them? The comics might traditionally portray Batman as someone who's at the edge of the line, but never really crosses it. He kind of always remains that way, but I think that's a bit unrealistic. Here's why:
We, as human beings, never stay the same. Our ideas, or notions of how some things are or should be change over time. You often hear people say "Oh, I was a different person back then", and, in my opinion, that's the point. I would have been pissed off if this Batman was 2-3 three years into his thing, but you can't expect a guy who's been doing what he does for 20 years to be as idealistic and optimistic as he was when he started. This Bruce Wayne is as broken and angry and frustrated as he was when his parents where killed. This arc might not be as obvious in the movie, but it's there. We get little hints all the time. "20 years in Gotham, Alfred, we've seen what promises are worth", "We've always been criminals". Bruce has become a hunter. Reckless. That doesn't mean he always was. In fact, by the end of the movie, we see him redescovering his faith in humanity, and embracing those ideals he had when he started being Batman.
Isn't that the point of this character? To remind us that no matter how deep we fall and how bad we break, we can always stand up and rise again?
Anyway, this is just me.