Basically, a remake/update of The Omega Man

Rating: 8/10 (10 January 2008)

This movie is better than I expected it to be. The first half is very well done, effectively creating the atmosphere of an abandoned New York City, but it goes downhill at the end. When it becomes "Will Smith vs. 500 CGI monsters," it's just not very believable. And the tacked-on happy ending seems out of place.
If you've seen The Omega Man, this movie will feel very familiar, with scene after scene essentially replicated. (If you stay through the screen credits, you'll see that the 1971 script by the Corringtons is credited as a source for the movie, along with Richard Matheson's 1954 novel.) I wish they had not made the Dark Seekers so primitive and savage in this version; the dialog and adversarial relationship between Neville and Mathis in Omega Man gave that movie more depth and substance than the horde of CGI monsters in this new version.
Still, I Am Legend is a pretty good movie, better than about 80% of the stuff they're turning out these days.