How bad is it? Low budget supernatural thriller that works, despite itself.
Should you see it? Yes. Not because it's so-bad-it's-good, though.
This is why I still watch Jim Wynorski films. His first films were thoroughly enjoyable trash, but then he started grinding out boob films with nothing else going for them. Occasionally, when he tries, he manages a fun little film like this one. A woman (Julie Strain) helps her husband succeed by killing off anyone that stands in his way. Then it turns out one of those people (Linda Blair) is a witch and people start getting payback. There's a lot of bad 80's hair and fashion... and a lot of boobs - it is a Wynorski film, after all - but there's characters you care about, a plot and some action. Grab some popcorn, sit back and enjoy.