[Tokolosh]

The plot and characters are different, but to me Harrison Ford was the same character as Rick Deckard, in the book. It felt like I was in the same world, with the same mood and apocalyptic look at the future, as described by Philip K. Dick.
Besides, a successful adaptation is almost always going to result in something very different than the source material. There are stories that won't work on the screen, when taken literally from a book.