I was okay with the plot of this book; its execution was what bothered me.
One of the things I loved about the original book, and, to a lesser extent, the second, was how well everything was paced. The places where the book slowed down and the places where it went a mile a minute felt natural. There was good flow. In Mockingjay, the plot seemed to move in fits and starts that didn't match the tempo of the events that were happening. A lot of the major events happen "off camera," so to speak, so much so that I began to question why we were still seeing the story through Katniss' eyes and not someone who was conscious or present for the events. Then, toward the end of the book, there's a rush of major events that don't seem to carry any emotional weight as the plot barrels through to the end. Now, I understand that Katniss would be in shock, and might not be feeling the full extent of the events, but it just felt...empty. Low impact. Rushed. I'm not sure I can properly qualify what I'm trying to say here, but it just didn't sit right with me. It didn't mesh with the Katniss I've come to know, and it felt as if I were reading a point form summary instead of the ending of the novel.
As well, I felt that the book's climax came out of nowhere, and the in-world reaction to it didn't make any sense to me. I actually reread the section several times trying to figure out why there wasn't a bigger uproar over what she did, or why she actually made that decision in the first place. The pieces of the puzzle are there and I can see what the author was trying to do, but they just don't fit together properly in my head. Feels forced.
Overall, I'm very disappointed with the execution of this book, particularly the last third of it. I do recommend that fans of the first two books read this one, but keep in mind that you may not be too happy with how the story is told.