I liked the fact that Clay had dick moments because it showed he wasn't perfect. He was this nice guy who was falible as anyone. Hannah hurted him too.
I also loved the fact that Hannah understood some things wrong. She was dealing with so much and had been so hurt that she became defensive and coudn't see that she was loved, that there were other people she could count on (like Tony, or other kids who weren't popular, Clay, her parents, the librarian guy, Kathy). When you're depressed you feel like everyone would be better off without you.
I felt for everyone but Marcus and Bryce.