To me it's the overall atmosphere, the cinematography, the sound design and the mix between gruesome horror and grotesque comedy that make "The Texas Chainsaw M

To me it's the overall atmosphere, the cinematography, the sound design and the mix between gruesome horror and grotesque comedy that make "The Texas Chainsaw Massacre" a truely outstanding movie. As others have mentioned, there is surprisingly little graphical violence, yet it manages to maintain an unrelenting atmosphere of madness and terror.