In case you still don't believe me, you are welcome to hop onto your favorite fan fiction site, such as AO3 [0], and search for stories over [large k] words.
[0] https://archiveofourown.org/works/search?work_search%5Bquery...
Also, I didn't say "correlated with intelligence", what I said was more of a cut-off threshold — asserting that one cannot be an actual moron given writing coherently on that scale is more of a boolean than a correlation.
I do need to write more (my own attempt at a novel has been stalled at "why can't I ever be satisfied with how I lead into the dramatic showdown!" for some years now, as none of my attempts have pleased me once written); but as for reading? Well, if you think my taste must result from insufficient breadth and depth, I must wonder what you think of Arthur C. Clarke, Francis Bacon, Larry Niven, Alexandre Dumas, Adrian Tchaikovsky, Neal Stephenson, Robert Heinlein, Alastair Reynolds, Isaac Asimov, Carl Jung, … I'm going to stop there rather than enumerate my whole library, but I can critique each in a different way without resorting to calling them playground insults, even the ones I dislike.
But I will say it was interesting to contrast Chris Hadfield's "An Astronaut's Guide to Life on Earth" with Richard Wiseman's "Shoot for the Moon" — or H. G. Wells with Jules Verne.
If we ignore that it's a rewriting of JKR's 7 novel series, which gives it a certain amount of coherency, Yudkowsky violates almost every writing guideline in a bad way. In fact, I could probably write an infinitely long coherent essay describing the ways HPMOR violates a reader's mind. It would be easy given almost 700K source material.
But to point at some gaping holes, the plot has no pacing, and the entire story is a badly written self insert where the mc goes around and "fixes" JKR's plot-holes by writing themself into a corner.
The solution to this, is, of course, to write another 20K words of expecto patronum, dispel the plothole with more rationalist bullshit.
Your average fanfic is probably better written.
I infer you favour Blaise Pascal: "I'm sorry I wrote you such a long letter; I didn't have time to write a short one."
his writing may be a little cringe at times and not anywhere near the prestige of "real writers" but it's perfectly entertaining for his intended audience