There is so many horror movies around, and so many of them are bad, that it is very hard to find something that is really worth watching. Well, this is one of the few that made the list.
The main appeal of this movie is its originality - just think, what can be more terrifying for a human being that being eaten alive? Well, it is being eaten alive by a form of life that we consider mostly harmless, but low and disgusting...
Another big asset is the whole visual aspect of the movie, really well polished by Russel Mulcahy. There is something really unusual and unsettling in the way this movie shows some banal things, like a sunset in the desert or some abandoned farm.
All in all it is a rare original and smart horror movie - if you are into this kind of things, go and get it.