If you have no experience with Unity, then this is an ok book to get you started. It will lead you through the very basics of how the program works, including things like what objects are, how to use the hierarchy, and other basic functions. It also has the added bonus of coming with an example cd that has things like models with built in animations, allowing you to simply plug them into the game and have them work. This is also its major flaw in my opinion. You can't expect to make a game using only unity. Most people who want to create their own games, and have zero experience with it, will need to know quite a bit of information not covered in this text. Far too much time is spent explaining how to use the landscape creator and place trees in your scene. That space could have been better used for other topics.
Most people who want to make their own game will want to design their own character and other assets. You'd need to use Maya or Max to model the character, to UV the character, to rig the character, and to animate the character. You'd also need to use a program like Photoshop or Mudbox to paint the character. While this may sound like a lot of added text, you'd be surprised by how little instruction it takes to explain these steps. Getting good at them is just a matter of practice. You cant write a book about game development and not include asset creation. For example, my game has a bird. I need to create a bird somehow, and get that bird to flap its wings. I know that I need to do all those things in Maya, and I manage to set up a flapping wing animation. Great, how do I transfer that animation form Maya to Unity? Google it and save yourself $40.
I am a game design student and picked up this book as a reference for when I needed to figure out how to do something in game, either via the editor or via script. I have been disappointed at every turn. Either the information provided is too limited or the example given is to basic that its not actually helpful. Luckily I generally know what I'm looking for and can use the Unity API scripting reference online to figure it out. I was hoping this book could fill in the places the API was lacking, but in reality this book has sat on my shelf for the last year collecting dust. After a month of trying to utilize it as a reference, I simply gave up. Every once in a while, I pick it up to look for something on the off chance it might shed some insight into what I'm looking for but I'm always disappointed.
If you have no experience with unity at all, and are looking for something to give you the basics, this isn't a terrible place to start. However, you can find better tutorials on Youtube for free.