I’d always assumed the criteria were loose (at best), but I didn’t realize that the only necessary condition of stating that a movie is “Based On” the book is a cursory glance at the book’s cover and a $150 million budget.
No, really; that’s it.
And I know “the book” is traditionally supposed to be better than the movie — but Darwin’s On The Origin of the Species has more in common with AVPR than Will Smith’s (and Francis Lawrence’s, or whoever’s responsible) “I Am Legend” does with Matheson’s.
The result is so unrecognizable, and so irredeemably awful, that–well, there’s nothing to say. The only tension in the movie was the hope, the slightest glimmer of possibility, that the filmmakers were bright enough to use the book’s best elements in a good way, or even a bad way.
Instead, they didn’t use them at all. They used a name, and a title, and a scary thing in the darkness.