It was just plain crappy. If it had been craptacular, that would have been something, but this was just crappy.
Boring, cliched, unoriginal, obvious, crappy.
Do yourself a favor, go see Arachnophobia or, better yet, Tremors, the greatest weird-monsters-attack-a-remote-town movie of all time. For Cthulhu's sake, even Them! is better.