This 1972 production is one of the first films to present violence in the context of American society, and not in castles or anything. Wes Craven, who is recognized with his 'Scream' triology by masses, does a fine job in his debut.
The movie's plot is as follows: A bunch of guys and a girl, think that they need more girls to their group for the sake of equalizing the number of girls and guys in the group, and of course having a little fun. We see two girls, who're to see a concert in a bad neighborhood. They want to have some 'grass', and ask someone in the street to have 'a cut'. He calls them to their house, and viola! They're trapped. It will be the next couple of violent hours where we see the girls being brutally harrassed, raped, and killed out in the woods.
What makes the story more interesting is that it all happens in the walking distance of Mari's - one of the killed girls - house. The group changes clothes and knock on the family's door. In fact, they will be welcomed very well. However, things will change as the parents discover what they've done.
The acting is not perfect; I must admit that. The soundtrack isn't either. In a lot of the violent moments, the music director chooses to put country folk music, which just doesn't make any sense. Had they put some real scary music, the effect would have been much more intensifying. However, 'Last House on the Left' is overall a successful production, which should be watched to see where we were before and where we are now in scary movies. In fact, I like the old movies.