SPOILER ALERT!
Allegiant  - Veronica Roth Ground rules for reading Allegiant:

1) Relive 'Divergent', 'Insurgent' before starting this (=check)
2) Don't read, glimpse any review and/or GR reading process before/while reading! (=check)
3) Keep an open mind, no matter what! (=check)

Whoa, ahm... I'm still disturbed about this. By far, this one was the darkest and heaviest. And I loved it.
I had the feeling that both 'Divergent' and 'Insurgent' were to give a certain mind set for the final story, to make you think and not just read.

Honestly, I get why most fans/readers might have been disappointed with the final book, or rather, the ending of story.
Yeah, so it was sort of dragging from the beginning. Than a small speed-up, than some more dragging, and heading with full speed til the end. Actually, I didn't found this dragging boring.For me, it was rather difficult and slow read, as it was full of theories, ideas and doubts and you had to pay attention to grasp everything. Like to much idea forced in an one sentence, and you should reread it, just to be sure, you got it. Still, I really enjoyed, but slowed me down nonetheless.

Everything you build up in ideas from the start of this series was confused, twisted some more. I've started to see Tris and Tobias more clearly. And... honestly... the ending was inevitable. Just like Uriah's death. Among all the others, he was the funny, smiley, easy-going guy despite of all the lost. He didn't have any place in this world, because he was too positive and moving-on no matter what.

What's clear: there's no ideal society. Ex-factions area (known as Chicago) can't do anything with freshly gained freedom. And the other-side-of-the-fence with all the scientific approach has already proven, they're just struggle for something ideal, but they are practically all the same (e.g. fringe = factionless). You cannot force people to behave this and that way, because you cannot break one's will and declare you're worth living and reproduce, while others are not.
Add this with the continual fight for power with no real solution for all the problems, just rolling them.

So practically, Tris, Tobias and all their friends/allies are switching one bad for the other.

And the inevitable happens, yes, Tris dies. There are no big debating about it and lining all pros/contras. It's like, this is her ultimate way. And it has to happen. Why? Because when all uprisings ended and conflicts somehow consolidated, she couldn't have exist in this new world. Because she didn't know any better than continuously fight, sacrifice, and loose what matters. If you don't have any more wars to fight and you can try to really live and have life.... what do you have? Even her relationship with Tobias would have changed. Not a happy reunion and moving on. Perhaps reacquainting, get to know each other again, but no guarantee be a happy couple. Watching the others at the end trying to find the place and build-up a new life with insecurities, taking baby steps and... just existing.

So I wasn't disappointed that there wasn't any HEA. This wasn't meant to happen. Tris fought off her fears way sooner than Tobias did. Tobias fought all his four fears only in this book. And his biggest fear was his father, and not losing Tris. That's why he focused somehow more to that. At the end, he did, but on short term, it didn't took him anywhere. Maybe in time, it will.

This review represents my confused feelings, so you can't find any logic in it (if yes, let me know).

I didn't have catharsis at the end of it. And, honestly, it's great because it represents the whole story. And because of that, when I read the last sentence my only thought was: This is how it should have happened.