In short: Good maps, pictures. Focus is on hard evidence - projectiles and such. Super dry. Quite a bit on methodological approaches used in the presentation of the material. Seems to be wide-ranging interpretive theories, which struck me as being all over the map, with considerable liberties taken based on limited evidence (Fagan asserts, but then more than often qualifies, suggesting significant uncertainty).
Throughout the book, Fagan states that all hunter-gatherers were egalitarian, which he defines as authority based on "experience and personal qualities" and "not political power." Other than several references to evidence from various burial practices and trade in exotic goods that indicate rank and hierarchy, it is surprising that Fagan doesn't discuss thoroughly the basis for such a generalization, especially when many places in his text indicate otherwise. For example, Fagan makes many references to a great diversity among the various Indian cultures, which includes those of the hunter-gatherer era that suggest the possibility that each band or tribe, and the larger associations of such groupings, had to figure out how to reconcile the issue of conflicting personal freedoms and exertions of power. Theoretically, unless there's a presumption that all of human nature is benign like Rousseau thought and that it was environmental influence (e.g., surplus) that corrupts humankind, it's not clear why there would not have been great variation in the way these issues were handled. And, after raising a question about whether "Southwestern farming villages" (i.e., not hunter-gatherer) were "far less egalitarian than often thought" (because of "long-distance exchange of essentials and luxuries by farming cultures usually results in some form of ranked society"), Fagan then states more generally that "whether Archaic, or even Paleo-Indian, societies were ranked is a matter of on-going debate." As the paleo-Indian era is generally thought to be 8,000 years ago, and as Archaic cultures (and its boundary with the paleo-Indian era "is often impossible to draw") hunted and presumably gathered too, though they placed greater evidence "on plant foods," it seems hard to reconcile this with his egalitarian characterization. Also throughout the text, Fagan references early North American Indian as being based on kin relations and reciprocity and that this is further evidence of egalitarianism. Whether families were equal in a fundamental sense (women, children vis-a-vis men, and among kindred men themselves), and whether all of these early groups practiced reciprocity (versus some did, some did not), also seems questionable.
As a final comment, it's a bit strange that a book on Ancient North America opens up with a discussion of Western Discovery (Chapter 1). Fagan ends his book with a discussion of Indian cultures after European contact. He admits that this is "still little understood," but then goes on to focus on the Southeast where he says "systematic research into the interests between the Spaniard and the American Indian has been most intense." Given the heavy Spanish involvement in the Southwest, and the little attention given to this area in U.S. history books, I wondered whether Fagan gave the Southwest short shrift.