If the box hadn’t indicated “Stephen King”, I would have never have known. This movie resembles more a reconstitution of Aliens. That doesn’t make it a bad movie and furthermore, Brad Dourif (Chucky, Child's Play) is a paranoiac exterminator, a role which fits him perfectly. The story is a bid slow, but that only makes the suspense better.
I do not personally have a phobia of rats, but for those who do, the movie must seize them. However, as much as a giant rat must be intimidating, it is very unrealistic.