The abysmal vulgarity of his American fascism is entirely to be expected from the author of Main Street and Elmer Gantry, both of which were made into movies when Hollywood made literature into movies and not comic books.
His Corpo State rather suicidally closes all the real colleges and universities, replacing them with worse than merely philistine, fake schools with curricula absent Greek and Sanscrit but heavy on close order drill.
Come to think of it, the ascendancy of Bozo brings Hofstadter to mind, after all these years.
And Ortega, and Marcel.
The far more macho writer, Hemingway, was all the same so much greater an artist of prose.
Come to that, Lewis was no artist at all, no more than Dreiser.
As a writer, his merits do not require, and are quite other than, that.
While even at his worst, Hemingway has that, always.
He is an artist of prose.
Novelists are not poets, so that side of things can be neglected in their estimation.
But that is a mistake.