When I write about Mickey Haller as the Lincoln lawyer, I totally see Matthew McConaughey because he took that character when that character was still fairly new to me - only two or three years old - when I knew McConaughey was going to play him. He's also the same age, the right age, in comparison to the book.
The criminal defense attorney is misunderstood if not despised by most of society. It doesn't matter if we believe in our adversarial system and the ideal that everyone charged with a crime is entitled to a vigorous defense. Ideals give away to reality - defense lawyers working loopholes and angles to get their clients off.