Incarceron: Literary Criticism

I just finished reading Incarceron by Catherine Fisher. I thought it was a good book, and I think that it was well planned out with good details and a great presentation on the theme of this book: prison. I've read a couple of reviews, most were really good, but some contained negative statements that I felt were a good critique of the book.
One review stated that the author takes similar concepts from other books and puts it all together in this book. They called it "the Hunger Games in the City of Ember. I think this statement can be considered true because the main character is in a prison that is (from what they can guess) underground, and there is no way out. Also, the characters are fighting to survive, which is also a main concept to the Hunger Games. Also, the critic comments that the book shares a similar structure to Leviathan by Scott Westerfeld in the way that both books contain a boy and girl main character with action going on with both of them at the same time.
Another book review says that the book was very predictable. It was easy for the critic to guess what was going to happen and who each character actually was. Unsatisfying was another word used by the critic, and she said that the author doesn't end the book that leaves you satisfied. You're almost annoyed at the end. Crowded was one word that caught my eye. The book was a little crowded and overwhelming. There was so much action that it was hard to keep up with what was currently going on.
I agree with both of the reviews: there are certain things about the book that were off, like the similar plot and the crowdedness, as well as the unsatisfying moment at the end. Although I agree with the critiques, I still think that Incarceron was a very good book, and I can't wait to read the sequel Sapphique.
My sources were http://io9.com/5502261/incarceron-is-the-hunger-games-in-the-city-of-ember and http://www.alisonsbookmarks.com/2010/07/review-incarceron-by-catherine-fisher.html which are critiques done by what seems to be a book review websites. It is credible because the authors clearly know the story, and the statements made are relatable.