This is a very information-dense book.
Ms Jensen seems to expect you to be able to keep track of all the rather esoteric information. As a rule, I'm able to do that, but this was a big book, and the book was slow, as Ms Jensen doesn't seem to know how do give the reader information without chunks and chunks of exposition.
To be fair, she did the worldbuilding for the scifi part of it well, and it was well-plotted. On top of that, she is no doubt a better writer than Dan Brown.
But it was hard to feel anything at all, even hate, for the characters, and that was the final straw for me. We won't even get into the rushed ending, rushed because the book is close to five hundred pages in trade paperback size with tiny font and the publisher probably wanted to cut it short.