Most of those people are probably fans who never read BP before the movie came out, the movie garnered interest, saw that Coates was writing it and jumped in whole hog. It reminds me of Guardians, The GotG book was awful after the movie came out because Bendis couldn't do space to save his life,(Im trade waiting the LosH, but I've heard things.) but it was held up by movie hype and great art. Same goes for BP.