I finished "Allegiant" and have now completed the entire "Divergent" trilogy. IMO the trilogy doesn't live up to the hype. I feel like the author loses her way somewhere along the line and whatever point she is trying to get across to the reader is not clear.
I think Veronica Roth is suggesting that family and loved ones are the most important thing in life and should be cherished above everything. Also, people are not "genetically damaged" just because they don't agree with the views of the government and they shouldn't be considered inferior and eliminated.
I can understand why young girls like the books. The romance between Tris and Four - all the scenes of kissing and snuggling - is aimed right at them. I do understand why many people were especially disappointed with Allegiant....they wanted a happier ending than they got.
For me this just wasn't a totally successful series.