I'm voting K on Malevil because I remember reading it in the early 80s (when I was in high school) and thinking it was deeply stupid with a combination of bad science and sexism. It took a heck of a lot for me to notice sexism at that point in my life, so I can only assume it was pretty terrible. I don't think I actually threw it at the wall, but that's likely because books that were even vaguely SF/fantasy were very, very hard to come by.