in my opinion, the most important thing that makes a novel good is prose. i know a lot of people would disagree with me there -- there are plenty of novels with great stories but bad translations, and plenty of people enjoy them enough to power through them anyway, but i personally can't do that. as for novels with good prose and bad storytelling... i don't think they exist. as i see it, poor characterization undermines prose (since it leads to unnatural conversations, which make for bad prose), and good characterization creates a good story, no matter what. good worldbuilding is a nice bonus, since it's much more conducive to characterization, but i don't think it's strictly necessary.