I recommend waiting for a sale or leaving it be. The plot developments themselves are good to know, but clearly do not take up the 178 pages in this book, what with all the dilly-dallying the authors did in the first few sections. Later parts of the book are good, so it's kind of a pain that it starts rough.
The "Detroit Rupture" section itself is just what the jackpointers keep saying it is- Bug City all over again. The fallout from the events is more interesting, but I think too much time was spent on the event itself (Which was pretty much just a Bug City/Boston CFD rehash).
The next section, "Ghost Army," is dialogue focused. Unfortunately, the dialogue's not that great, unless you enjoy killer lines like "Bravon wun tree this foxtrot Zulu wun wun." The reader can infer that they're using the NATO phonetic alphabet for military radio chatter, there's no need to show the dialect. Personal dislike of mine, I don't like when people write things like "runnin" or "gotta" in dialogue, either. It becomes distraction, rather than enhancing the reader experience. It also feels a lot less authentic when later on they say "Sitrep is red, repeat red." I don't really expect perfection in military lingo, but saying repeat on the radio means you want to repeat the last barrage of artillery fire. It doesn't mean the english meaning. It just bothered me that the author went to the effort of getting the authentic pronounciation of the NATO alphabet/numbers, and kept throwing in things like "fubar" for the sake of it, but still made easy mistakes like that. Honestly, the level of forced military lingo in the rest of the section makes it almost comical- I don't mind over the top, but there's no substance to the characters beyond the fact that they use military lingo.
No major complaints about the Blackout section, but kind of boring to read. Possibly my fault, since I listened to the SCN podcasts and I loved those a lot.
I liked the UCrASh section quite a bit- a lot of places got love that normally wouldn't. The Seattle independence has been a long time coming.
Detroit Now and Atlanta Now were also well written, and "As the Dust Settles" was useful for folks who got bored during the first few sections of the book, but wanted to know what happened.
It's a little odd that a "chiark" (Cheetah-shark?) monster was introduced in "Ghost Army," but not placed in Game Information. There was plenty of white space available for a stat block.
One thing I noticed is that there isn't really all that much art in the book, which is fine for a plot book, but it made the boring sections worse. (I'd also rather them have less art, than hire more artists and not pay them. So there's that.) There's also lots of typos- things that a spellchecker won't catch, but a human editor would ("All most", "Bravon", etc). Some weird grammatical things, too. "Saeder-Krupp controls the rest of the building, renting out half of it. Everything else is rented." So, half of it is rented, and the rest is rented? Par the course for the SR line, but this stuff is still annoying.
Edit: Revising to 4/5, Dani made a good point, and it was only a small chapter of the book. Def won't go to 5/5 though, because of the editing issues and other issues in the book.
[4 of 5 Stars!]