I wouldn't recommend as a beginners book.
It introduces game theory in a 'pokerish manor'; like the AKQ game. It presents you with a whole host of game theory ideas, what it doesn't even attempt to do is to tell you how you go about incorporating these ideas into your own game.
I was reading something by Ed Killer today and it talked about an optimal strategy and then went off at a tangent as to why optimal strategies at low stakes are not the strategies obtained through game theory. His argument boiled down to this. In order for a game theory optimal strategy to work, it requires your opponent to make correct and consistent game theory decisions. So rather than setting out to play a GT optimal game, instead two players will constantly adjust their play because of their opponents behaviour until eventually an Nash equilibrium is reached. However as only the best players are capable of making these kind of subtle adjustments, the reality is that your opponent is unlikely to make correct adjustments to your plays, and then adjustments to your adjustments and so on.
Therefore a Nash equilibrium is never reached.
Therefore if you completely understood the mathematics behind game theory, you are still very unlikely to be against an opponent who you could use a GT approach on.
And more importantly, if you understand the maths AND are against a sufficiently skilled opponent, are you at a point where you can identify what his adjustments are?
With that in mind, is it an important aspect of study at your current level??
If you are taking poker seriously you need to build a solid ABC game and then develop that game rather than trying to build a GT optimal game and then work backwards.