I just bought a comic which has, apparently, the best Two-Face stories.
It only shows just how poorly writers have portrayed him. He's so weak when portrayed as a simple criminal. But there is a story in the collection that is really special. I believe it's called Schismed Faces and it really nails the Dent character.
Basically it revolves around his "ghost cases" and how Two-Face wants to settle them. It emerges that prior to his transformation Dent wanted to proscecute a variety of people on mere suspicion alone, there was no proof of wrongdoing but he just had a hunch.
I love that approach and, honestly, would love to see a short Two-Face series detailing these ghost cases. Where the homicidal nutjob tries to do what the firebrand DA couldn't do.
Seriously, read that story, you might like it.