The low rating is mainly due to the level of cleanliness and the state of the building - cobwebs everywhere (even in some of the cupboards), dead bugs (the one on the bed caused a particular feeling of disgust), mould in some of the pans, some hairs in the hot tub, ... the list is long, but these were some of the highlights. The facilities are generally quite run down, so don't expect the level of comfort that the pictures might suggest.
Personally, I quite liked the solitude of the location. There are some houses right next to the accommodation, although I've never seen any people around. You definitely need to come by car though since there are no supermarkets or pubs within walking distance.