Here’s the opinion of philosopher Georg Lukacs, writing mid-20th century:
“Great realism, therefore, perishes in the era of decay. And besides the overtly apologetic anti-realism and pseudo-realism of the literature promoted by the reactionary bourgeoisie, we have a long train of tendencies that try in a very ‘radical’ and ‘avant-garde’ fashion to liquidate the very foundations of realism.”
Lukacs was for “the unity of democratic tradition in social life and realist tradition in art; the consequence of this unity being a constant striving to give art a popular character, and an unseparable connection with the great problems of national life.”
He could’ve been talking about the situation of American literature today.