The Batman thing didn't piss me off at all. Honestly, how many times has he turned on his allies and friends for less reason than that? He's played a bunch of games just to test people. It's sick, and in my opinion he doesn't get to whine and whimper when they manipulate him like he did them.
What infuriated me, and ruined the Zatanna character for me, was what they did to Catwoman. It bugged me not only in the story, but as meta. "Oh. She was never *really* a hero. She was just mindraped into being one!"