The legendary Wes Craven made one HELL of a debut with this grindhouse shocker! Crude, nasty, and mean-spirited, this film proudly pisses in the face of decency and I adore its attitude. In my opinion, it remains Craven's most effective work. Sure, it lacks the slick meta fun of "Scream", nor is it as groundbreaking as "A Nightmare on Elm Street", but this beast is like a dirty drillbit that gleefully tears through your brain and stays there.
Much like Tobe Hooper's "The Texas Chain Saw Massacre" a couple years later, "Last House on the Left" is a stillborn bastard child of the turbulent times in which it was spawned. By 1972, peace n' love optimism spread by the hippies had given way to a bleak outlook streaked in innocent blood. This film takes that dichotomy and emphasizes it to the highest degree. Despite the catharsis of revenge that happens in the third act, there is no redemption here. There is no hope for something better. There is only a cycle of violence leading to more violence - endless blood and suffering.
I think what sets this film apart from Craven's other works, apart from its snuff film style, is that it makes a statement. It doesn't preach, it just shows. It lets the violence happen without pretense or meditation. To contrast the grim and gritty brutality, the film is punctuated with a bizarre, upbeat, hippie-folk soundtrack. We also get a subplot involving two bumbling cops trying, and failing, to save the day. It's jarring. It doesn't fit. And that's exactly the point. It only makes the horrific things we watch Mari and Phyllis endure all the more shocking.
Any gripes? Slightly. Mari's parents are painfully boring and underdeveloped. It's hard to truly feel for them and their quest for vengeance. Perhaps some better dialogue or an extra scene or two with them would have helped matters. Or, more likely, the actors just sucked.
I believe "Last House" was a necessary film for its time and place. It's where innocence goes to die an awful death, where terrible people meet their end only after causing irreparable harm, where rape and murder happen to the soothing sounds of an acoustic guitar. It's outlaw horror at its finest, best watched on a worn-out VHS tape in a cold basement in the middle of the night during a manic-depressive episode. A true masterpiece!