The 1970s saw a plethora of doomsday/ecological disaster sci-fi films hit the movie screens - most were complete tosh, some on the money (check out Silent Running), one or two were classics (Dark Star). The Omega Man, the second filming of Richard Matheson's classic novel of fear and vampirism "I Am Legend" starts off well - there's really something about a deserted American city, the long vistas up arrow straight streets and a lone car driving (if you ignore the obvious mistakes of other people and other cars you can see...) and the obvious solitude.
Unfortunately the fork between the quite brilliant novel and the film then begin. In of itself the film isn't too bad apart from 'The Family' and its techno-hating medieval babble. Heston plays Heston (when didn't he) and is of course as wooden as a crate but if you haven't seen this movie then it's worth seeing for the first five minutes alone.
It's the weakest attempt of the three versions of the book that have been made and I'll be one of the dissenting voices and say that the Will Smith version isn't all that good either (the latter half a complete waste of a promising start). When someone finally makes I Am Legend as it was written we'll have a classic.
So, in summary The Omega Man is worth checking out. The book is definitely worth reading.