This will go for the series as a whole, instead of just Mockingjay. 
 I loved the first book. I really did. I hated that Rue died, but I knew she had to. She was a tribute after all, and by preparing for Peeta's death, because I didn't foresee the ending (which tells a lot about the author, because I usually can foresee the stuff that happen), I prepared myself for Rue's death, and I figured, well, Collins killed one 
 12-year-old, surely she wouldn't kill another one? 
 But no. And I loved it, even though she killed Prim. Prime-the original reason Katniss went into the Games the first time: keep Prim alive. And by entering the games, struggling to live, to save herself and Peeta, and Prim, BAM we have revolution, we have war, and wait for it.....Prim-the original reason this was set in motion dies. Simply dies. You know, Katniss should hate Collins, for she has killed Prim in a more gruesome way. And made Katniss watch. Made Katniss watch Prim get blown to pieces. After killing her father in the same way, thoug at least she didn't make Katniss watch that too. As if Katniss needs more nightmares. I wonder if she has sisters. Oh wait, I found a quote from an interview: 
 "I have two older sisters and one older brother and hold them largely responsible for the trouble I got into growing up. I believe as the youngest child, that is my right." I really don't know what to make of it, for I haven't read her other series, but what exactly does she mean? May be that's why she had Gale murder Prim. I don't care how indirect it is, he killed her and that's that. Which is why when I see reviews about how Katniss should have stayed with Gale I feel sick to my stomach. 
 All in all, I loved the plot, the tension, the story, only I didn't like the death of so many likable, important characters who deserved a happy ending, and ended up killed(Finnick, Wiress, Mags, Prim, Rue, CINNA, and almost everyone else that died), while leaving a despicable and disgusting characters(Enobaria, GALE, and others). 
 All in all, I get the impression, especially after ruining Peeta's memories of Katnis, that the author really hates her own characters. Or just doesn't want to give them a nice ending. I don't ask for happiness, I ask for healing. Katniss never got healed. Peeta was always on edge after being tortured in the Capitol. Katniss never evolved. I know you're angry and your sister just got murdered, but I think that loss, sorrow, despair makes people angry but compassionate. Katniss used to have that, in the first book. Remember how she covered Rue's body in flowers? But when asked whether there should be Hunger Games for the Capitol's children, she wants to put them through it. After whining for the most of the three books how children shouldn't be put through that. It's kind of disgusting on her part. 
 But I still love the story, though I would love it more if it had a better ending, and better events in it. And of course, some love from the author for the characters.