I don't know the book so everything I comment on is sorely based on the (alternate) movie version.

And simply seen as a movie it was one heck of a dissapointment. First off, the whole scenery is wrong. Shiny cars and clean shops and only a slight bit of wild vegetation are not what I have in mind when I think about a time 3 years after an apocalypse. Then there is the story that seems to have no purpose. Althought it started out well and seemed interesting but that's it. It just seemed. Things are happening, the movie ends and I wonder what was the reason. I was actually wondering if I fell asleep and missed a part. Felt more like a pilot for a TV show. What's the point ? Sience can backfire ? That in trying to reverse the effects of the virus that made monsters of the few survivors Neville himself became a monster ? That's not only thin but a rather hollow morale. And the monster angle puts this in the realm of unbelievable. And my biggest issue: how on earth did Anna and Ethan get there in a car ? Manhattan is an Island, is it not ? All the bridges where destroyed and the tunnel flodded. And how do they leave ? Why is he legend ?

Ultimately this movie, for me, was a waste of time.