No coherent structure. No systematic approach to anything at all. No details about developing cmdlets or providers in a book ostensibly for developers. Frequently refers you to online resources. It is essentially just a bunch of unrelated examples. Each chapter is interesting enough in its own right but that doesn't make it a good book.
A fairly random assemblage of topics. Many of the examples use internet APIs such as Twitter, or screen scraping search results from Google or Bing. These APIs have changed since the book was written as have the CSS class names in search results that are relied upon, so the examples no longer work. On the cover it says "enhance your productivity and enable rapid application development", but the book certainly does not live up to this claim. Not up to the standard one expects from O'Reilly.
This book seems incredibly disjointed - it's a pile of interesting examples with no logical coherence or structure. Although useful, it has glaring holes, nothing about roll your own cmdlets, vast references to online resources that are no longer there... a paucity of interfacing to the outside world unless via .NET.... If fleshed out a lot - like if you tripled the amount it could be useful but at the moment it's simply not worth the money
I have not yet read it from cover to cover (which I do with almost all my books) but the stuff there is interesting and certainly helpful in understanding the inner workings of PowerShell. If you want to know PowerShell from a developer's perspective, I'd recommend this book but be prepared that it might be difficult to understand stuff from time to time. But that's what I call NORMAL. Just don't give up and press on.
This book is a bunch of mumble tied together in an incoherent format. I don't know what it's for, providing neither reference nor instruction. I learn't a whole lot more in a lot less time by going through a few well commented examples I found on the web.