The novel is rough-edged and often reads like a first draft, vs. the brilliant polish and attention to detail of the film.
Absolutely the case TB. I reread the novel about once a year and am still surprised at Puzo's lack of continuity, sentence structure, etc. Still, it's a great story. The film? What can I say that hasn't been said already.
Usually, novels are better than the films on which they are based. However, not in this case.