Robert J. Sawyer's first book in this series, Hominids, was enjoyable, in spite of the hand-waving explanation of the connection between the universes. The characters, especially Ponter, were interesting and well-drawn.
The second book, Humans, represented the beginning of Sawyer's descent into one-world kumbaya utopian preaching.
This volume, Hybrids, consists of a thin plot grafted onto Sawyer's personal PC worldview.
Everyone in the Neanderthal world is an atheist bisexual environmentalist and their world is just about perfect, cue John Lennon. And let's not forget the obligatory Dan Brown-ish attack on the Catholic Church, can't have a enlightened book these days without that.
Among other ludicrous lines, the sapiens world North Vietnamese government is described as kind. Not as bad as many totalitarian regimes? Sure. Not as corrupt as the South Vietnamese regime? Could well be. Kind? Oh dear lord.
Sawyer quotes Solzhenitsyn's phrase that the line between good and evil runs through each human heart, but very tellingly fails to include the entire statement. I quote from The Gulag Archipelago Two:
Since then I have come to understand the truth of all the religions of the world: They struggle with the evil inside a human being (inside every human being). It is impossible to expel evil from the world in its entirety, but it is possible to constrict it within each person. And since that time I have come to understand the falsehood of all the revolutions in history: They destroy only those carriers of evil contemporary with them.
The full context of Solzhenitsyn's quote is precisely contrary to Sawyer's portrayal of an atheistic neo-Marxist Neanderthal paradise.
But my favorite was Sawyer's list (via Mary) of the handful of decent men in the world. The list included Phil Donahue. I laughed because I thought at least Sawyer was showing a bit of wit. Then I realized he was serious.
Never mind the mysteries of how a race which eschews competition could produce a technically advanced culture (especially with less than 1/20th of the population of the sapiens Earth, better breeding for intelligence doesn't explain that). Maybe there is an explanation, but Sawyer doesn't offer one.
Prior to the development of the Companion how did the Neanderthals judge whether someone had committed a crime? 80 years of supposedly perfect justice being used to wean out bad genes doesn't explain what mistakes may have been made were made in the past, when justice was far less perfect.
Occasionally Sawyer raises problems in the Neanderthal culture (such as unreported spousal abuse). But these read as throwaway issues so he can avoid the charge of writing a complete whitewash. He never explores how such issues could lead to wholesale difficulties. Again, any problems in the Neanderthal society are portrayed as minor individual trifles, never anything systemic.
Frankly, this trilogy reminds me most of Harry Harrison's trilogy, Stars and Stripes (an alternative Civil War history where the bumbling British manage to attack both the USA and CSA, and the combined USA and CSA forces pretty quickly smash the Brits, take Ireland, and conquer London).
One side is nearly perfect and decent and brilliant and the other side is nefarious and cruel.
There are no complexities, just the good guys triumphing over a bunch of bad guys. Take Harrison's trilogy, substitute Neanderthal for Americans and evil white men for the British, stir in a lot of politically correct attitudes, and you'd produce something similar to Sawyer's trilogy.
The best alternative history accepts complexities and portrays all cultures as something far less than pure. Sawyer, due to his obsession with pushing his weltanschauung ahead of everything else, fails miserably in this regard.