Most Helpful Guy
Too many story lines: rape, suicide, failed suicide, anger management, gay relationships, guns, school shootings, bullying, drug addiction, broken marriage, privilege of wealth, etc. By having so many story lines, they failed to adequately address any of them.
Most Helpful Girl
I do not think that the second season was necessary at all, the first episode had a quite good ending, just as the book did. But for something that was probably just made in order to stretch the story a bit further to make more money it was alright. I didn't expected much though.