Why Dickens is considered on of the great writers of English literature has always eluded me. He may have been important in his era, but his writing has not stood the test of time, as Bronte's has, in my opinion. The fact that he was getting paid by the word is blatantly obvious to anyone who has read him, but this is not even mentioned in the documentary. Another central flaw is the weak performance of Lesser as Dickens. Also the fact that the narrator has a serious speech impediment is ultimately too distracting to hold one's attention over 3 hours. Dickens may have been a mystery, but ultimately who really cares except for those few remaining 'fans' of his writing, and judging from the number of people who have rated this documentary, there aren't many left.
Oh, another major flaw is the use of the BBC adaptations of his novels which were even duller than the documentary, but then they probably couldn't get the rights to classic films like those of David Lean and George Cukor.