3 stars is a travesty.
Used to love this as a kid and just watched it again. I can't believe how low people have rated this, this is the definition of an amazing midnight-type movie. It's very well-made for what it is, and some of it is fairly disturbing (this is PG?). I loved the rat sound effects, and the special effects on the whole. Some of it is really obvious (especially the matte shots) but I'll take this over crappy CGI any day of the week.
If you had any idea what kind of movie this was before watching it, what on Earth were you expecting? Why do I get the feeling that many people who gave this one star drink up the terrible dialog in movies like Star Wars like as if Lucas was god's gift to cinema?