Where and when did your friend see this film? How long was it? I've read the book and since about half of it contains dreams and hallucinations, there really is no way to simply film it as written.This is what my friend had to say about the movie.
"i saw a test screening of this and thought it was dreadful. i'm a fan of scorsese, too. i definitely thought it was kind of strange that a scorsese movie was being tested to begin with. it's painfully obvious that he's just trying to film a book, and not adapt it for another medium. one of the most poorly-paced films i've ever seen."