There's no much to add from the previous books, to be honest. 

It lost me at some point, when the Holo was introduced. But I reconnected with it after it, I even shed tears alongside Katniss. Felt her losses. 

Would have loved to live a little more in their new world, but that wouldn't feel much like an ending, would it. 

Anyways, I absolutely loved this series. I love Peeta, and I love Katniss, and I want them to live as happy as they can be. 

Death.
Madness.
Sadness.
Hate.
Broken families.
Broken hearts.
This is what war brings.
And Suzanne Collins makes us understand it, in the worst (but also, the best) possible way.

I can't say it's a perfect novel, but I can say it's one of the most real, most true stories ever.

I didn't particularly enjoy the beginning of the book, which I found slow and unnecessarily long-winded at times.
However, the authoress' excellent writing style comes through again in this last volume.
Although she doesn't use a particularly complex language, she makes vivid and clear descriptions of the events and always manages to capture the reader's attention. Her strong point is the great emotional leverage she has on the reader, which at times, though, proves to be too overwhelming.
Her skill is such that the protagonist's emotions are mirrored by the reader, who continues to suffer, rejoices in small victories, but continues to be tired and destroyed along with the main character. For this reason,  reading can often be confusing and tiring.
Some narrative choices, however, such as the love triangle between Peeta, Gale and Katniss, (already present in the previous books, but in this one with an higher importance) can sometimes be superfluous.
The characters are always well characterized and some of them have interesting evolutions (as for Peeta or Beetee), but the great number of different characters can sometimes make us lose focus on the single ones.
Katniss, in this book, is subdued, she is not the strong and fighting protagonist she used to be.
She is emotionally destroyed, tired, upset, indecisive, suffering (and the reader inevitably feels all this).
For this reason probably, the narrative speed is sometimes intercut and not linear

(the mission to retrieve Peeta, in which Katniss is not present, lasts only one chapter, while convincing Katniss to become the Mockingjay takes 3 chapters or more)

.
The story, despite everything, after the initial part is very engaging.

I particularly enjoyed Katniss' "visit" to District 8, the battle in District 2 and the final mission in Capitol City.

Even though the story is told by a teenage protagonist (and with precarious mental and physical conditions, to say the least), the story of the war is realistic, raw and painful to the right point.
The final part of the book is the most frenetic, but at the same time the most controversial.

As the story goes on, the districts, from being victims, begin to become executioners and the similarities between President Snow and President Coin begin to become worrying.

Sometimes the danger results excessive, almost "targeted" against the protagonist; I also considered the death of some characters superfluous and useless for the plot:

while Boggs' death is symbolic and useful to send Katniss on her mission, Finnick's (just married and one of the few really happy characters) and Prim's deaths don't seem necessary.

We notice more and more then, how Katniss is not herself

(the girl who was on fire would never have accepted to make children take part at the Hunger Games again)

, but in the final fortunately the girl is able to recover, at least a bit

(killing President Coin is her final gesture of rebellion, her awareness as a representative not so much of the rebellion, as of justice herself)

.
The ending is not perfect, but it remains consistent with the story told, albeit terrible and painful.

At the end, it's back to the starting point. The author's greatest flaws are at the same time her greatest strengths. Yes, Katniss is over-emotional, but that's justified in situations like those depicted in the book. Yes, the death of some characters may not have made sense, but war does not follow a logic. Rich, poor, young, old, good, bad: war affects everyone with no holds barred.
I cannot say that "The Hunger Games: Mockingjay" is a perfect book, but I can say that it is one of the books that really left something in me. I can say that the Hunger Games, that Katniss, Peeta, Haymitch, Gale, Prim, Finnick, all the others and everything they went through, will always remain in my mind and in my heart.