the worst part isn't even the garbage, it's the "good plot written in very bad way"

you power through it, you get invested - but you know that nothing will ever come out of it and in no way can you recommend it

Good plot / bad writing seems like a good fit for a film adaption if you get the right director.

And yet, it's not unusual that a poorly written book gets a decent movie adaptation. Sometimes it's not even a good plot OR well written, sometimes a book is just popular and the execs cash in on its popularity.

I'm thinking things like Da Vinci Code, 50 shades, Twilight, neither of which (the books) are particularly good or tasteful or whatever, but they were very popular, appealing to people who normally don't read books.