I liked the brutality, the voice modulator, the comic accurate suit, and the intimidation factor.
Was completely turned off by the machine guns and killing.
Killing when it's a moral conflict is okay with me, a la Bale as Batman and Superman killing Zod in Man of Steel, but this wasn't. I get that he was a jaded Batman who lost his way, but the movie would have been more powerful if he hadn't crossed that line yet and killing Superman was the first time he was going to cross it until his moment of cognitive dissonance.