The Green is extremely entertaining on a number of levels. It gives the reader the vicarious pleasure of believing that many of those guys out on the tour have 'feet of clay' with their own foibles. Even though they get to play and get paid 5 or 6 days a week, the author would have you believe that most have some personality defect that the common guy doesn't.
On another level, Eddie, the lead character, is everything we wish we could be, in or out of golf. A hustler yes, but dig below the crust, a complex, honest, and talented person, unwilling to put up with the BS of the profession. He's an iconoclast, supremely confident of his own abilities, ready to thumb his nose at traditional concepts.
If you don't love this book and this guy, you don't like good fiction and the game of golf.