If you've just bought a guitar, and know nothing about playing, this is a great place to start. Not only does it teach you the techniques, but also teaches the theory. What is also good is the pacing, starting off with simple chords and building to soloing techniques such as bends, hammer-ons etc.
After a couple of months, I now know lots about the guitar I did't previously. So why 4 stars? Well the book rather ambitiously states that you should be good enough to play in a band after 3 months. Well, after 3 months I have progressed, but I don't think I be joining any band soon. Maybe if you where a music prodigy like Mozart......
I would really recommend the books by Troy Stetina as an excellent followup to further extend your playing.