Unnamable? I'm not so sure about that. Let's try...marginal acting, weak soundtrack, heinous adaptation of H.P. Lovecraft, boring as crap. That's a start! Wow. This one is bad. I never knew a horror film could be so boring. The basic storyline goes something like this...a woman gives birth to a hideous creature in the 1800's. It's so ugly they refuse to name it. The monster grows up, kills the family and is then entombed in a burial vault. Now it's 1988 and a group of teenagers decide to check it out. You pretty much know where it goes from there!
The monster in question only appears as a hand on screen for most the the film. This is NOT a case of "less is more." This "less" is "less." We needed to see some more of the creature in order to have any sense of interest in this uneventful film. Yes, there's blood and people get killed. However, the murders are neither interesting nor shocking. I found myself saying through the whole film, "Who cares?" I doubt you'll care either.
For more info check out the film's entry in IMDB.