I should mention i never read the 3rd book, every review on goodreads screamed to stay away so i did. Not sure if i missed anything because of it, but it seems like I didn't.
I really like this as the ending to the series. It had a good amount of action and kept me interested throughout the whole thing.
The only issue i had was the dang alien green light thingy in the sky. Like seriously, that wasn't a nice ending, all I'm gonna do is wish for a 5th book to explain that!
Overall it was good and i read though it quickly, which is always a good sign for me :]