I have picked up two-page short stories that were hard/impossible to get through. For me, bad writing is bad writing, regardless of length. If interest is not established, or if prose is rambling and disjointed, or even if plot seems secondary to literary-masturbation, finishing is a fictional concept.
In translation, bad writing can be bad translation, would be the first point. Second, writing is far more of a two-way relationship than any other art form, it is more difficult to establish just what it is a reader is getting or not getting from a story or book than from a TV show or movie or album. So I was asking questions relating to these things.