Do ever find yourself watching something, and then suddenly realize that you've had this stupid grin on your face the entire time?
Yeah, this is one of those kind of shows.
Prefectural Earth Defense Force is pretty much 1980's anime distilled in a single, 50-minute OVA. It represents everything that made anime in the eighties what it was. And I mean that as a compliment. If you're the type of person that ALSO considers it a good thing, then this is for you.
It's definitely a ridiculous premise, but that's sort of the point. It's not supposed to make logical sense, you just have to roll with it. Just like you roll with, say, Project A-ko. Or Urusei Yatsura.
Love the character designs. Love the characters. Sometimes the slapstick does get a little too slappy. Unfortunately, this is all of PEDF that was made. So, I guess if you want to watch more, you'll just have to watch it one more time.