Its by no means a bad movie, and will smith does a surprisingly good job at portraying Robert Neville, its just the last quarter of the movie that really just fell flat. I actually laughed at the last line of the movie. Don\'t go if you\'re a book purist and want it to be an exact representation of the book, its not, and it doesn\'t try to be.
That said, pretty much everyone I talked to who hadn\'t read the book loved the movie. So I guess if you can wipe your memory of the book, its a lot more enjoyable.