This book is all about the illustrations, which are remarkable, though the front cover is really the masterpiece, and the rest of them are much more diagrammatic, less beautiful but perhaps providing more insight. With these diagrams, one definitely gets a feeling of density within the cells, the sharp proximity with which the chemical and mechanical machinery of the cell interacts.
The text is just fine, written with clarity and consistency at an accessible level. The writing definitely has the feel of a textbook, covering what is clearly known without journalistic or scientific straying into the new or speculative. Despite that, it is not too dry, always maintaining an appropriate brevity to keep an engaged pace.
For the most part, the book proceeds hierarchically, starting from the nature of the chemical interactions that allow biological components to do their work, to some of the basic components and processes of every living cell, to the cells of E. Coli (as a representative of bacteria), to the multi-component cells of humans (and other eukaryotes), to the varying architecture of different tissues; but then moving to the molecular boundaries of humans as seen from interactions with viruses and other chemicals.
If the book presents any frustrations, it is that it remains fragmentary, at the level of a tour, rather than really digging in to many of processes step-by-step in a way that reveals their machinery. If a given protein is for cutting, then how does it do the cutting? If a given system can detect and destroy a parasite, how do the components of the system work together to do so? The book proceeds along the lines of: here is an engine cylinder, here is an engine, here is a hydraulic pump, without getting into that step-by-step understand that really reveals how it works. This book is "The Machinery of Life: A Tour" as opposed to "The Machinery of Life: A Step-by-Step Guide to How It Works". This is a fair trade-off: the book covers a lot of ground without much complexity or difficulty.
Overall, this is a nice tour of the machinery of life from chemicals to tissues, giving an illuminating view of the parts, if not the processes, by which it all works.