In this final book of the Hunger Games trilogy, the Mockingjay has become the symbol of rebellion. I am so glad my friend lend me both Catching Fire and Mockingjay together or I'll be left hanging.
People of Panem are now at war against the Capitol. After the events of Catching Fire Katniss wants to personally kill President Snow. Peeta is now mentally unstable. District 13 actually existed and was not totally annihilated.
Some people don't like some of the final events. But this is war. Katniss will also have her feelings for both Peeta and Gale resolved. I don't want to spoil the last book by writing any more.