I'm not really a great fiction reader but this story sounded interesting. I enjoyed the story a lot and think it is well worth a read if you like horror, vampires or last man alive in the world scenarios.

The ending of the book is darker than the movie.
So if you enjoyed the movie, I think you'll enjoy the book too. Actually, if you thought you would enjoy the movie but found it a bit silly in places don't write of the book. The vampires are more vampire-like and are clawing at his door in a tamer way from day one.

I think there is still scope for a more true to the novel film adaptation.

I also didn't realize that "I Am Legend" is just one story of many in a collection of short stories.