I heard of machinima about a week ago in the Economist magazine which also featured comments from Paul Marino, this book's author. A week later and I've got the book, but I'm a little let down but what the book has added to my knowledge.
I'd say someone who has only heard of machinima and hasn't designed their own level in a 3D game would get tons of gems from this book. Whereas poor me with a week's worth of Google searches looking for tutorials on UnrealEd 3.0 and so forth - well I only got enough information to round out my status as a serious machinima beginner.
In fairness, however, after a couple of hours with the book I was able to get the finishing touches I was looking for and successfully burned my first machinima movie to DVD. So it was a small boost I got but a very welcome one (the boost included my spending $29 for the full version of Fraps). So, yeah it will give you the tools in one place to get a finished product.
I am disappointed that Marino ends the book with a tutorial on character modeling. The tutorial is well-written but by its end you'll be looking at a cute character cast in concrete (no words on skinning or rigging, etc). Worse this character will be stranded in a program called Silo (by the way blender from blender.org seems just as good and is cross-platform and a free download) with no hint of the challenge of getting this spaceman into a 3D level designer.
The machinima community would be better served with a tutorial on how to get custom sounds and meshes into UnrealEd et al, and how to do lipsynching.
In short too much time spent teaching you how to use tools (tools generally come with their own instructions and tutorials anyway).
I was also disappointed to find no samples of machinima movies on the cd. These are such a pig to download after all. How about including one and then some kind of analysis about what makes that one sample special.
The book is called the Art of Machinima but it seems more like the Activity of Futzing with Tools.