As in the first book, Hominids, there is plenty of fascinating (to a science idiot like myself) anthropology, physics, hypothetical technology, and hunter-gatherer sociology. Great stuff.
This time around it's marred somewhat by a romance novel storyline between between a woman from our world and a Neanderthal man. Some might like it but it felt silly and distractingly schmaltzy to me.
Overall it's worth it though. I'm looking forward to reading the final book, Hybrids.
Okay, but not up to Martin's usual standards. The protagonist oscillates between unlikable and despicable. There is a moderately interesting element of the story that allows him to see himself through the eyes of others and realize what a major asshat he is.
The alien world and creatures were rather monotonous and uninspired. I've seen Turtledove, Tepper, and Sawyer books that took advantage of new worlds to explore social nuances and implications in great depth. Hunter's Run felt like a wasted opportunity, especially in light of Martin's amazingly deep work with A Game of Thrones and Wild Cards.
Perfectly serviceable Pratchett. As always, the plot was adequate; as with Douglas Adams, Pratchett's genius lies in his writing itself. Fun fun stuff. This time around, he takes a few more shots at Christianity--I mean, Omnianism--and organized religion.
While I was able to follow along, it was pretty clear that there were several previous books that this one continued. I would have enjoyed it more had I read those first, I think.
Fairly epic, the story takes place at various stages over the next century, allowing the author to preordain world political and social evolution for the next several decades. Various antagonists emerge then kind of fade away; it's not really a three-act story.
In my untrained evaluation, the science and sociology hold up remarkably well. It's all very plausible, sophisticated, and interesting. Kress takes a long hard look at racism and oppression but turns it on its head by making the victims a measurably superior group in terms of intellectual, technological, and even economic power.
There's actually not much of a plot. The storyline is just a skeletal framework on which Heinlein builds his future society. He expounds endlessly on systems of government, "moral development", and military tactics and technology. It was actually pretty interesting.
Dated language was a little distracting from time to time, but overall it was quite a good read.