I think you're supposed to be at least somewhat disappointed at the ending. Katness was too damaged to have a HEA, even before this book and things just get worse in Mockingjay. I don't know why people are surprised by her voting for the Hunger Games. I thought it was explained when she wonders if it was the same way for the people who created the first Hunger Games. They were manipulated into choosing the lesser of two evils. The choices were kill everyone or kill just the ones chosen for the games. Plus, the games would take longer to plan and set-up, therefore buying time to find another solution. I would have rather her been with Gale, but he never fought for her, he just let things happen. If they make two movies for this one, we'll get to see more than just her POV, including the trial.