It may have been "great", but Michael Douglas' character takes it down a notch or two with his over-the-top acting and bad dialogue. Really, this film's dialogue is nothing to rave about, but Remington's is twice a bad as anyone else's save Beaumont.
The movie still manages to be watchable, however, in spite of those two. The premise is interesting, the cinematography is amazing, and the rest of the actors aren't half bad.
I couldn't really see this as a horror movie; it works better as a low-key adventure flick. I rented it for three dollars, and I don't feel like the money was wasted.