"A page-turner, no doubt, but..."
The preaching about the dangers of relying on technology gets a little old. If it had been straight-up post-apocalyptic thriller, it would have been fine; throwing in a couple of comments about how dependent we had been on technology would have been OK, too, but the book really beats it into you. Still, I could hardly turn the audio off on this one. If you are interested in similar themes (minus the preaching), try Lucifer's Hammer (huge meteorite) or The Stand (flu pandemic).