I remember Battlefield Earth. I read it just a few years after it came out, bought from a used bookstore because, even back then I didn't want to put money in that guy's pocket. Yes, I read the whole 1,000+ page thing (unlike another large, highly-touted-by-fans novel), and his writing style IS kinda-sorta like Heinlein's, but there's the lack of paying attention to tiny details that Heinlein and so many other great SF writers were and are so good at.
Somewhere in the middle of Battlefield Earth, the MC is some sort of assistant or slave to this alien that (IIRC, and I could have this pretty far wrong) runs the Earth department of this interplanetary/intersteller mining business. In one scene our MC is looking over the shoulder of this alien who is doing some algebra. MC is good at math, but is having a really hard time following the alien because the alien uses Base 12 arithmetic.
This really struck me as BS. Algebra is mostly about manipulating symbols, and the numbers are usually just constant multipliers or additions. One can estimate the order of magnitude of a base 12 number just by counting the number of digits (presuming the writing is anything like the way humans use Roman numerals).
I continued to read, humanity was saved (I don't remember the Harriers, but whatever), and I at least felt an accomplishment in, if nothing else, having read such a long book.
So, were ALL these novels published by commercial publishers who have books for sale at the local Big Box Bookstore? It sorta gives me hope for my own writing. Trying not to wipe my nose now that I know it's a totally gross thing to do on a date.