There's something problematic about watching movies that reference stories before reading those stories. All the way through this one, I kept picturing Marlon Brando whenever Dr. Moreau would speak, and not even the original Brando, but South Park's version of him!
Nevertheless, I was able to enjoy the book and shut out the visual representations of Dr. Moreau long enough to get a good sense of the original story and the horror the audience must have felt along with the protagonist, Edward, in seeing the creatures that inhabit the island. The most horrific thing of course is the transgression of the line between human and animal, and Wells' morality play creates the kind of horror that makes this transgression clear without bashing the reader over the head with it, in part, because Edward Prendick, through whose eyes we see the events on the island is a bit of a prude and unimaginative while being highly superstitious. It's one of those books where they choice of narrator lets the author pull off what might otherwise fail if the action were seen through another character's eyes.