Tonguez
A suffusion of yellow
It actually took me a while to realize the Fantastic 4 were Marvel. Though I knew of Iron Man and Thor, as well as Spider-man, Captain America, and the Hulk (who I do not enjoy). I don't know who Martian Manhunter is however.
It long been established that DC's Batman, Superman, Wonder Woman and Flash are the most famous Comic superheroes and the only 'Golden Age' heroes who gained lasting recognition. Indeed Superman and Batman have become so iconic that their cultural presence extends beyond comics into the realm of modern myth, that was one reason why BvS was so widely panned, people had big expectations.
DCs characters are mythic in their scope, Superman is the Messiah sent from higher powers to save the earth, Batman is reluctant avenger, the one man who must stand against injustice,Wonder Women is a goddess made flesh and The Flash is the fastest man alive.
Marvels characters in contrast are just people who get lucky, the teenage who was bit by a spider, the scientist transformed into a monster, the righteous soldier, man in a iron suit, a whole slew of oppressed mutants. Of these properties only The Hulk and Spiderman have joined the list of recognisable comic tropes during the 1960's and that for most of the public is it.
Before the MCU you'd probably have more people who knew who the Phantom (Ghost Who Walks) and Mandrake were than knew about Ironman or Black Widow. Marvels greatest success is that they were able to take second tier characters and repackage them for movie going audiences.
DC needs to play up its mythic nature but to do so the directors need to understand the mythic tropes inherent to their characters. Batman as dark avenger works in a grim world, Wonder Woman appears to have found her fit too, the challenge is Superman and his persecuted messiah complex