Finished Mockingjay

I just finished Mockingjay not too long ago.

All I can say without spoiling it for others who haven't finished it that I really didn't like the ending of the book.

I thought it was rather slow at times and I would wonder off thinking and not concentrating on the story.
Now I can't wait for the director of the film to be annouced. And the cast, epecially the cast. Who isn't waiting for that?