More like 3.5 stars. 
 Honestly, I liked this up until the end. And it wasn't what happened at the end (though I didn't like that either) but more . . . how it was written. 
 Veronica Roth is a very sparse writer--which is not necessarily a bad thing--but sometimes leads to a story reading as sort of plain and sterile. I thought that type of writing worked very well for the urgent, exciting storyline of the first novel, Divergent. Short, to-the-point sentences are exactly what you need when writing action and things of the like. 
 But Allegiant is a much more introspective story. At least that's how I felt. There wasn't much action. Honestly, there wasn't much anything besides personal epiphanies and relationship struggles/mendings. Ms. Roth's sparse writing style doesn't work well for that. I think that's where so many of the reviews about "bad writing" are coming from. She is not by any means a bad writer, her style just doesn't lend well to a story with this much internal struggle. This is why the ending didn't work for me. 
 I will admit that I spoiled myself as to what happened. There was one scenario I did not want to be caught off guard by, so, for me, this is what I had to do. Now, I've spoiled myself on other books as well and STILL cried buckets when they ended similar to this. But Allegiant? I didn't feel a thing. 
 I wasn't sad. I wasn't mad. I wasn't anything. 
 I'm sitting here trying to think of why and all I can come up with it how it was written. It was too quick, and the feelings described afterward didn't make *me* feel along with the characters. 
 Some writers have the ability to wrench feeling out of their readers no matter what they write. Others don't, and I just don't think this worked well. It could have been done much better. 
 I don't really know exactly how I feel about what happened. I don't really feel like it was necessary, but I have read the author's post about *why* she felt it was, and I guess I get it. I don't know. I don't really agree or disagree. This was her story and her characters, and if this was what felt right, then who am I to argue? Would I have ended this this way? No. But I know there'll be those out there that love it as it is. 
 I still love Tris and Tobias (Four). I have from the beginning, and they'll still be characters that stand out in my mind because of who they were. I wouldn't discourage others not to read this just because of the end. The characters themselves are worth the journey.