I admit I've never understood why anyone would have wanted Two-Face to be a setup for the next film. That's not to say I didn't like him. On the contrary, Harvey was my favorite character, and I thought his arc was the strongest aspect of the film. But that's my point. The Harvey in this movie wouldn't go on a crime spree. It's not in his character. He fell into madness for very specific reasons, and his only criminal acts were against very specific people who had wronged him or Rachel. I thought we saw exactly as much of him as we needed to see. To have taken him any further would have made him into just another ad-hoc villain.