I love watching this movie. I love this dialog in a "horror" film. I got myself a copy on DVD and watch it at least a few times a year. There are some classic lines between the city folk vs. the bumpkins. Fonda's line about the sarcasm being too subtle is great (while spraying RAID in the middle of Maine). Betty White is building her career these days being the tart-mouthed old broad (see "Boston Legal" - another David Kelley production). Also, the interplay between Oliver Platt and the actor playing the sheriff are priceless.
Contrary to what others have written - I think the special effects go just fine with the overall campy and comedy feel of the movie and the amount of gore is also appropriate. More would change the tone of the film from the comedy which I enjoy, to one more of a gross-out nature.
Just a favorite of mine. Try it if you, for example, liked "Love at First Bite" - you will probably like this too.