Extremely disappointing, 2/5 stars. Bad science, medical correlations with weak evidence, bizarre spiritualism. Another attempt to resurrect debunked 19th century psychology, yuck.
Good characters and interesting story but the tech, science, and economics are all bad and the plot had too many bad excuses for fighting / violence. 3/5 stars.
The beginning and end are great. The middle wanders a little and some of the libertarian objectivisist pontification gets tedious. I like Flynn's writing style, though 4/5 stars.
I did not enjoy this one at all. I did not like the universe, the characters, the motivations, the aliens, or the deep dark background mystery. The story itself was good. 2/5 stars.