Or is he "just enough of a bastard to be worth knowing"?
He is the one who uses guns as a "weight to moral arguments".
People who threaten his bookshop will go missing. (in the book)
He can lie, twist the truth or go around the rules when necessary.
Worse yet, I noticed Aziraphale uses Crowley's feelings (friendship/love/ desperate need for someone to ease his loneliness...) to try and manipulate him.
Here are the scenes that come to mind.
1) Hamlet. Azi being like , Honey, I'm out of miracles, would you mind?
2)The stain on the coat, of course. (getting Crowley to do the laundry)
3) Satan is coming. Azi to Crowley: "Do something, or I'll (he's wielding a *flaming sword*...) I'll never talk to you again!"
And it works every time. Even when they break up and Azi gets in trouble, Crowley will rush back to save him, apologizing (even dancing!) while having done nothing wrong!
What about you? Did you notice anything else unangelic about him?