He is, right up until you piss him off. Which is hard, granted, but if you manage it?
There's the time the Gotham City police arrested her (she was escaping Louisana after being arrested for beastality... for being with HIM), and he went over there, demanded his wife back, and basically fucked Gotham City up entirely when they didn't do it. Even kicked Batman's ass.
Eventually Batman got them to release Abby by convincing the mayor to drop the charges ("Oh, you're going to arrest every human in a sexual relationship with something that's nonhuman, even if it's completly sentient? Lemme call my buddy SUPERMAN and see what he thinks about that"), but in general, he's a pretty chill guy.