I’m not gonna lie: Marvel Super Heroes was a shit comic. After introducing Captain Marvel, the anthology series descended into awfulness. #14 was a solo Spider-Man story that was created as a fill-in issue. It’s the first time Ross Andru draws Spidey, so I guess that’s cool, but the story is just awful. Spidey Super Stories were better than this.
#15 is a solo story about Medusa, back in her days with the Frightful Four. It was designed to lead-in to a solo Medusa book, but that never happened. Proabably because the comic sucked.
The book had been one new story, backed up with several reprints. #16 is all reprints. At least I think it is—there’s no creator credits anywhere to be found.
Then for #17, Roy Thomas and Howard Purcell tell an expanded origin of the Dane Whitman version of Black Knight—the heroic one. Arguably, it’s a more important issue since Black Knight becomes an Avenger in the future, but…It’s Black Knight. Nobody cares.
For the complete history of the MU, year by year, go here.