I'm a few hours into book two. I get really engaged by a few parts, mainly Luigi and the Wall Facer project, but then someone jerks me out if it. Whether it's too much attention to something that doesn't need it, or something randomly nonsensical, or "why don't the Sophons just fuck with that too?"
Part of the problem with this series is that there's no tension. Reading the second book I don't have the slightest inkling that anything that takes place will be remotely valuable to the events of the third book, and ultimately, the final conclusion.
I really feel like reading a Wikipedia summary article would be just as enjoyable as reading the novel.
I get that, even when you know the destination, the journey should be fun. But with this book, it's just tiring.
The problem with the Wall Facers from a narrative prospective
Is that the author doesn't do a good job with it. It's a very interesting premise and has some very cool possibilities. However, 2/4 of the way through the Wall Facers, it's all poorly handled. So and so does something for half the book, then suddenly a random guy shows up, shouts out some big secret, and the whole thing disappears. There's no coyness on behalf of the Facers for readers to pick apart, no sort of tension or cat & mouse game, no impact afterward. So much time is spent on Luigi that the other three might as well be footnotes.
I didn't hate it, didn't love it, thought it was pretty average. For every good and compelling part there was one that was simply excruciating. It's not as deep as some people would lead you to believe too. Character development is pretty much zero, there's a ton of nonsensical aspects, and the whole Sophon thing is nothing more than a McGuffin.
I don't know why there's another novel in the series as this ended on a pretty nice and final note.