How bad is it? It makes no sense and is a typical example of bad 1980's horror.
Should you see it? It's developed a following, so if you love cheesy horror, perhaps.
This is another film that I keep adding and deleting from my list. Teens discover mutants under the Golden Gate Bridge; the mutants, each different (like a horror "Village People"), kill everything in sight, with no explanation. It turns out that they're controlled by aliens - with no explanation. Why the aliens are here and what they're doing is also never explained. The teens, when the police don't believe them, discover that the alien/mutants can be killed with water - again, never explained. The film then devolves into a squirt gun fight.