I remember watching the original when it reappeared on video a few years ago. Even now the first kill, one brutal hammer blow, is pretty shocking. I watched the film in the same frame of mind as I watched The Exorcist - ie remember that this film was made back in the 70's and it will have 70's production values, effects and so on.
I watched the remake when it came out and thought that, for a remake, it was rather good. It also had Jessica Biel's shapely buttocks and bosoms as a prominent feature which always helped. The "Sheriff" character was good too, if you ever see the making off it explains that a lot of his dialogue was made up by the actor on the spot.
I went to see "The Beginning" on Friday night and have to say it wasn't quite up to par IMO, both the original and remake are more enjoyable.