If you loved Lost but thought it went out on a bad note (whether it was the finale, the season, the sideways world, etc), reading this book may bring back your appreciation for the show and see its last season in new ways.
Like many people, I felt cheated at the end of Lost when they left so many mysteries unanswered. I still liked the finale, I was OK with the purgatory twist, and I really like how the story ended. But I was still angry that the producers would throw so many mysteries out there, and just ignore them for the most part. I thought that if they just didn't know how to explain them then they were lazy and if they just didn't want to tell us, then I found that very insulting. I still bought the DVD, and like every year, bought Nikki's book.
But this year's edition has restored my faith in Lost for the most part. I'm still annoyed that we still don't know who The Others were or where they came from, and they made up a ridiculous explanation for The Numbers ("Jacob had a thing for numbers"? Really? That's the best the producers could come up with?), but I found that the episode writeups and the 50-page chapter on the finale helped me to stop caring about those mysteries, and appreciate things about the characters, their stories, and the island that I hadn't really thought about before.
Every chapter on an episode will go back through the seasons' stories on that character, for example, for Sawyer, many of his past episodes and island stories are analyzed to give context to his Season 6 episode, and you see a completed arc to their story, on the island as well as in the sideways / purgatory world. And while I liked the two "mythology" episodes this year, the chapters on these episodes makes you better appreciate the significance of events in the episodes.
The chapter on the finale gives you so much more to think about, for example the theme of The Constant is applied to each character (not just Desmond), looking at who their constants were, and what it meant to their island and purgatory lives. This is an example of a topic that seemed important in a few episodes years back, and Nikki brings so many of these themes back into her analysis of the season, that it helps you appreciate so much more of what Damon Lindeloff and Carlton Cuse were able to accomplish in their stories over the years, that I was able to get over their lack of answers to mysteries.
There is also a chapter with her own theories on many of the unanswered mysteries. While you might not agree with all of her thoughts, it'll still get you thinking about possibilities, and she does make a point that if we just spent Season 6 having mystery after mystery explained, it wouldn't necessarily make us appreciate Lost overall, as much as the way they did wrap up the characters and the story.
Whether you enjoyed Season 6 or not, this book will raise your appreciation of Lost and help you get over unanswered mysteries. And when you think of it a year from now, or many years, if you've read this book, you probably are more likely to remember it as the greatest TV show you ever saw.