Well, this idea has been reiterated in one form or another already. But I figure it could be expanded on. And I'll just assume we're restricted to literature.
Fantasy writers, for example. They're just telling a story. It could be 1 month old or it could be 1000 years old, doesn't matter, you try to pass off most novels(if anything, just "really detailed screenplays" these days) as "brilliant writing and literature" to an English professor or Literature professor or whatever and you'd get nothing but urbane laughs, the verbal equivalent of a condescending pat on the head and the recommendation of a book by a dead white guy, dead white woman(18-19th century only), etc.
Then you have some, I'll just shoot off some obvious ones anybody in the American education system should find familiar. The Great Gatsby, Jane Eyre, much by Shakespeare, Catch-22(duh). Sure they all cover massively different topics and the scope of their narrative may be far more limited than...oh say...the Halo series that makes you buy a crapload of stuff to get the whole story, most of which ends up supplementary and irrelevant to the games anyway.
But why they're considered brilliant pieces of writing is because they offer commentary on a particular topic, and insight into the society of the author's time period. Gatsby and the Jazz Age. Eyre and the...19th century roles of women? Who knows? Yes, they can be as boring and uninteresting as watching paint dry or grass grow but they've still got some impressive subtext. The kind that whoever writes Sparknotes or whatever can only scrape at.
Feel free to throw in Ayn Rand wherever you like.
Of course, you have those that straddle the line, or clearly exist on either side of the spectrum. Frankenstein, for example. Or Cat's Cradle, by Vonnegut, who clearly enjoys much popularity. Heinlein, Asimov, Bradbury. Basically you look at any given list of "celebrated works of literature" or whatever other name they decide to give it, and you can pretty much guarantee most of the science fiction up there is cautionary sci-fi.
But at the end of all of it, beauty in the eye of the beholder, right?