They totally missed the point of the book's message. "I Am Legend" doesn't mean, "They'll remember me because I found the cure to this disease, so humanity will remember what I did and that I saved them!", but "They'll remember me because I am the last human on Earth, and I've killed so many of those creatures. When I die, their race will regard me as a legend, 'The man who brought terror to our kind'.". I think In The Mouth of Madness was a BETTER I Am Legend than this movie was, cause despite it being different, it got the "message" of the book with: "Every species can smell its own extinction. The last ones left won't have a pretty time with it. In ten years, maybe less, the human race will just be a bedtime story for THEIR children. A myth, nothing more.".