This review will be colored by the fact that I have a philosophical background in enactivism, and I am unacquainted with the standards of theoretical soundness in the social sciences. I'll start with what I like. Malafouris unfolds the implications of enactivism and embodied cognition for the archaeology of human cognition, a field defined by explaining the evolutionary development and history of cognition on the basis of archaeological studies and theories of ancient civilizations. He has penetrating criticisms of major theories in this field; they understand that cognitive leaps in our evolutionary history are caused by discrete ecological or technological events. Malafouris argues that this understanding presumes an inappropriate, uni-directional causal framework. Instead, given the insights of enactivism -- that humans are fundamentally embodied, coupled to their ecological niches -- we need to understand the interactions between material environment and cognitive capacities as occurring in a manner of circular, dynamical causation. He goes on to argue for a methodological shift in archaeological studies of material artifacts. Rather than ask about the role of the artifact in the hypothesized ancient society, or how the artifact might've been used, we should ask about the ways by which the artifact might've "scaffolded" human cognition, or expanded or enhanced the possibilities of cognitive tasks. This is fair.
But Malafouris draws flawed conclusions on the metaphysics of material artifacts and of cognition. His failings mostly stem from his tendency to conflate facts that must be separated to two domains: there are (1) causal facts about the world, independent of any observer, and (2) causal facts that appear in the world observed by a subject. It is a grave category mistake to assume that facts from one domain hold true in the other domain. Malafouris is right to conclude that in domain (1), human cognitive capacities are coupled with the material/technological objects in the human's ecological niche, so cognition and the design of these objects co-evolve, or co-constrain the possible ways each can develop over evolutionary history. He, however, is wrong to infer that this means in domain (2), material objects are literally component processes in the cognitive system, as much as neural processes are components. Yes, Malafouris concludes that there is a "symmetry" between the roles of material objects and neural activity with respect to cognition. This is just bad reasoning. There is clearly a difference between the ways human cognition and the environment dynamically co-evolve over evolutionary time, and the ways by which a particular human's cognitive system interacts with the environment at a synchronic point of time.
This book is an illuminating read for people who are not familiar with enactivism and embodied cognition, or who have an interest in the evolution of human cognition, or who want to know why it looks like we are so "smart." I would warn any reader, however, to not take Malafouris's metaphysical conclusions seriously. I also do not think this book is worth a reader's time, if the reader is already familiar with enactivism. Malafouris's sound arguments about material artifacts and evolution are intuitive, given knowledge about this field, and this book will not introduce any radically new ideas.