This movie's pretty blunt and straight to the point, so I can keep it brief.
What Have They Done to Your Daughters? Is an Italian crime/horror movie that follows a group of characters trying to catch a serial killer who's targeting teenage girls. It's the kind of premise that's been done to death, but it's the way it's done here that's interesting. It's fast-paced, surprisingly well-shot, memorably bloody, and also features some great music. In fact, it's the music that cancels out the bad dubbing, really, because while most Italian movies from this time don't have very good dubbing, this one kind of goes one step beyond, because it's really bad at points.
I can see these crime/horror/thriller movies from Italy in the 1970s being the next genre I hyper-fixate on, as I've done with kaiju movies, samurai movies, and martial arts movies. There's something really interesting about them (I'd call them Giallo movies, but I'm not entirely sure yet whether this particular movie counts as Giallo).
So overall, What Have They Done to Your Daughters? Isn't anything new when it comes to its story or characters, and it's kind of sleazy in parts, but it's well-made and consistently engaging, making it a pleasant surprise to watch, because I wasn't expecting this to be of a moderately high quality.