I'm going to be blunt. This book was a disappointment.
Why? Maximum Ride was a great idea, that started off excellent and fell from better to worse. While the first book, The Angel Experiement, is one of my favorites, this book really threw me off the series. Since then I've continued to read the books just to follow the series and see where it goes.
So far it hasn't gone anywhere. Anyway, I though the ending of the third book was fine. It would have been a pretty good place to end. This continuation of the series drags on, losing focus (and probably readers).
I personally find that it has too much... "global warming" advertisement in it (not that it's a bad thing). I just feel that "go green" is pressed too much in the book, as if Patterson makes a visible effort to reiterate how important it is to be environmentally aware. Perhaps a good to get another environmental message out there, but this is not the way.