When I read that there was a TV adaptation of Lawrence Wright's book I had great hopes. The result is not disappointing, the show is quite good, Jeff Daniels is perfect in his role and the story of John O'Neill is perfect for a movie.
But the writers decided to focus only on the final part of the book, which details the internal wars between CIA and FBI which allowed the 9/11 plans to proceed unchallenged. The first part of the book, which describes the history of bin Laden and al Qaeda, starting from the ideology of Qutb, would have been much more interesting to understand what is going on in the world today. But I understand that story would be perhaps more suitable for a documentary than for a TV show, but it's a story that Wright wrote beautifully at that will deserve to be put on screen someday.