So I just finished Mockingjay this afternoon. For what it's worth, here are my thoughts...
I think the author does a great job of presenting questions about authority, power, government, individual responsibility, and violence. Of the 3 books, I thought HG was the best overall story, CF was ok (mostly because so much of it was transitional) and MJ went back to being amazing. My biggest pet peeve was that by the end of MJ there were SO many characters it started to get overwhelming and I felt less connected to the action. But I was definitely on team Peeta, so I was quite happy with the ending.
1. I don't understand why Finnick had to die. I wasn't happy that Prim died, but I totally understood why it had to happen. Finnick just seemed to be one more dead person and she never really finished the story with Annie.
2. I was SHOCKED that Katniss voted in favor of another round of HGs with the capitol's children. I was especially shocked that this never became an issue between her and Peeta, and then nothing actually ever came of it in the book.
3. I did not love the narrator (I listened to the final 2 books on audio) - she sounded too old for a 17 year old Katniss. And I think that Katniss' age, and the fact that this was to a certain extent a coming of age story, was too important to the books to be mixed up like this.
Otherwise, all amazing.