Ambitious and well-informed, but politically and emotionally implausible in key respects. That, of course would hardly be a criticism in much speculative sci-fi (hell, it defines the genre!) but good world-building invites us to embrace certain implausible (or outright ridiculous) foundations, by drawing us into a compelling story or novel vision, hopefully both. Here, alas, the vision far exceeds the power of the underlying stories to draw the reader in, and so the limits of character development and political-institutional simplicities become increasingly grating. Still, things could be (marginally) worse: he could have written Neal Stephenson's Termination Shock instead! :/