My main complaint when I first saw it in the theaters was that it was a bait and switch. Having previously read the book it was obvious that they wanted to make a pool movie but had no confidence in it doing well unless they could bill it as a sequel to the Hustler. So, they basically made an essentially unrelated pool movie that had nothing to do with the world of the Hustler other than the name of the movie, the name of a character, and the actor playing that character. It was a decent pool movie, but had none of the complexity of character or nuance or moral ambiguity that the Hustler, book and movie, had and that the book TCOM had.
I agree..I liked the book better....Walter understood a lot about pool playing.