I just don't see how anyone who didn't read the book could follow the story at all. The book was so watered down, and the story is almost unrecognizable. We saw precious little of Booby Miles' complexity or the pressures around him over which he had no control. We saw almost nothing of Chavez, one of the very few players who actually made something of himself, or what effect the high school football experience had on his success in life. And the other players ... their personal lives were so affected by what happened that single season, and it was pretty much ignored. There was so much background about the frenzy that Mojo generated (and still generates) in Odessa that just wasn't shown.
That being said, I can see why the people in Odessa so disapproved of the book and loved the movie. The movie doesn't show the rather affectionate, yet unflattering picture that Buzz Bissinger painted of the town. Instead, it only showed the stereotypical hype of small town football. After seeing the movie, PLEASE do yourself a favor and read the book.