Scared me to death as a kid but let's get real. If this would be a new release, this would not do well at the box office. I doubt an 18 year old would give this a high vote.
However, given for the time (with like zero convincing special effects by today's standards) this is a truly well made flick. The sound alone has a Jaw like feel. And David Pleasant fits in perfect.
So, well made movie for the time but puhh... bored me stiff watching it.