From someone who read the book's review

Rating: 7/10 (27 December 2007)

I heard of I Am Legend the film a while back and i thought i should read the book before i see the film.
So i read the book several times and finally the film is here and i've just seen it.
The book focuses mostly on a humans fragile state of mind and how easily it can be shattered by events beyond their understanding or their control, this also rings true in the film.
The story goes that a doctor has taken the measels and has suppusodly found a cure for cancer but then people die from this new cure virus and some mutate into creature.
In the book the origin of the virus is never explained and the book refers to the infected humans as vampires yet the film just depicts infected people as anamalistic creatures.
The new "Krippen Virus" has killed most of the population and th rest are either immune or mutated.
Robert Neville who is the main character, everyday gathers new supplies, hunts deer, tries to develop a cure etc etc.
After a very important turning point in the film Nevilles already fragile state of mind collapses and struggles to continue in this world which he doesn't truly understand.
The film is depressing just like the book and the film follows relatively close to the book, but the film would have been better if it followed the ending in the book as that was more dramatic.
If your planning to see this film i would definitely recommend reading the book first.
7/10