I kept thinking that I must have written a review already, but when I double checked I just realised I ranted and raved in the status update whilst reading the book but didn't really put something cohesive. Here's the reason why:

This book sucked.

This series sucked.

I don't know why I finished the series, except that I must be some kind of sadist/masochist rolled into one, or that my curiosity in seeing the end of this train wreck overshadowed my sensibilities. And even that was stretched thin, as I found myself skimming through Maxon's inane letters at the end (with a lot of eye rolling).

To be sure, more actually happened in this last book than the first or second combined, but not much which made sense. After finishing the book, I kept thinking of ways that this series (which had quite an interesting idea, but horrible execution) could have been made to improve - and there are many. I would refrain from expounding on them, as I have only just managed to calm down from flinging the book to the ground in disgust. Others have written at length at how terrible the book/series was and why and I ask that discerning readers go read them - it's quite entertaining (more than the book in most cases) and completely therapeutic (if you've had the misfortune of actually finishing the books).

Overall I can't help but think that this is another one of those examples where a series is written to create hype, with the hopes of catching the eye of some director, who would then get an actual decent writer to re-write and make into a movie. Which would then sell for millions, because have you seen the number of brainless 5 stars reviews??