Speaking of crappy covers for paper backs. Science fiction novels seemed to get hit the worst back in the seventies and eighties. The art might be good but you had to wonder if anyone had told the artist what the book was about or where it was set. You know, the space age bimbettes with hardly any clothes who are supposed to be scrambling around in a jungle full of creepers, spiky plants and critters with lots of claws and fangs.
One I really got a kick out of was Hal Clement's Mission of Gravity. It was set on a high grav planet with oceans of liquid methane. Three g's at the equater, much, much higher at the poles. So what was on the cover? Something that looked suspiciously like a taller, skinnier version of Seattle's Space Needle. Go figure.