I think it is not a really bad book as it provides quite a good introduction to Zend Framework. Especially with a lack of any good Zend Framework literature i guess it may be still worth to read it.
I would not recommend it to people who work with Zend Framework already. You will probably not find a lot of new information in it. If you are starting your journey with Zend Framework or with MVC in general i guess you may benefit from the book quite a lot.
Book also provides some nice foundation for the CMS design. So if you decided that Drupal is not good enough and you want to spend months writing your own CMS then you may want to check out this book :)