The characters were all annoying, although I did find myself warming slighly to Cornelia towards the end, but I think that generally they didn't inspire much emotion.
I think that is a very important observation. I've read books where otherwise unappealing characters won my sympathy, simply because the author was able to make me feel their pain, or empathize with some strong need. Here, the characters sometimes go through several different emotions in the space of a single page. Cornelia and Brutus spend a fair amount of time yearning after each other. And while all of this struck me as an obvious plea for the reader's sympathy, I never felt any of those emotions myself. They always seemed too false for me to buy into them.
Even one character whose emotions seemed genuine might have kept me reading (or at least skimming) to find out what happened to him or her. It wouldn't have changed my opinion of the book as a whole, because there were too many other things I didn't like, but I might have finished it.
The length was a factor, too. Since I didn't finish last month's book, I really wanted to do better with this one. But halfway through I thought, no, I can't continue on for another 300+ pages. There were a few things I was a tiny bit curious about, and I might have kept reading if the end had been in sight, but with so many pages ahead it was too much.
I know that she is a
very popular author and that she has won many awards -- or maybe the same award many times -- so I'm sure she has written much better books than this one. Unfortunately, based on my experience here, I'm unlikely ever to read any of them. It would be interesting, though, to learn what it is she does so well elsewhere that is missing in this book, if anyone here knows.
Oh ... and regarding the labyrinth: Since an unicursal labyrinth always leads you back to approximately the place where you started, I wonder if this series is meant to bring the characters back to their beginnings in some way, at the very end. I might take a peek at the end of the last book to find that out.