Like Marvel's predecessor, Timely Comics, Marvel Science Stories was part of the Red Circle imprint, published by Martin Goodman, who would later become a cousin by marriage to Stan Lee. Red Circle books covered the gamut of westerns, detective stories, weird menace, and adventures, but they appealed to a baser instinct than most of their competition. That's right, Red Circle dealt with the "spicies", those salacious stories of sin and sadism that seem so utterly quaint in today's age of Game of Thrones.
Originally, Marvel Science Stories adhered to the growing fannish standard of science fiction. But as editor Robert O. Erisman learned, sex sells:
"I was just about to write you a letter of complete congratulations when my eyes fell upon Kuttner's "The Time Trap". All I can say is: PLEASE, in the future, dislodge such trash from your magazine."--William Hamling
Some of this is just fannish snobbery, as Williamson explained. And Marvel's sister magazines "Dynamic Science Stories", "Uncanny Stories", and more fell along the same pattern, with similar disdain for the quality. "Historians identify only three stories of quality: Nelson S. Bond's "The Message from the Void" (published under the pseudonym "Hubert Mavity"); L. Sprague de Camp's "Ananias"; and Manly Wade Wellman's "Insight"."
So, if it was not for the publication of Marvel Science Stories by a smut peddler of its day, science fiction would have continued to stagnate in the mess caused by Hugo the Rat's predations. After all, as Gus Grissom said in The Right Stuff, "No bucks, no Buck Rogers."