All right. It's just a monster movie about a bunch of people trapped in a Carpathian cave getting munched on by winged critters. But that doesn't absolve the film-makers from the responsibility of building characters you care about, so that aforementioned munching has some meaning. Ah, well. It was beautifully shot, so the art director deserves big props. The technical detail seemed quite authentic, and better than the movie deserved. There are enough PG-13 frights to make the climax tense, but in no way was this "good." I'll give it a C+, because I have a softness for cheesy monster movies.