This is more of a prejudice than anything to do with the story itself, but if a story has less than a thousand words per episode, I generally won't read it. I learned a lot of my "this is a bad story" flags from reading fanfiction, and if a story averages closer to 500 words - or even less! - per chapter, I take it as a sign of a lazy writer. That's why I've ended up not reading a lot of novels on Tapas, since they tend to reward shorter, more frequent chapters.
I also pass over a lot of stories if I'm not impressed with the summary. I think some people forget that a summary is supposed to tell people why they should read the story in the first place.
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"I'm bad at summaries, just read it." Well, with an opener like that, how could I say no? If you can't even write a summary, then you probably can't write a novel either. Even a low-effort one-sentence summary is still a summary. Hell, I'm bad at writing summaries, and I still make the effort!
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"What will happen?" The entire point of reading a novel is to find out what happens. Don't end a summary with this. Don't begin a summary with this. Don't put this phrase anywhere in your summary. Just don't.
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"One is an X, the other is a Y." I've seen hundreds of these, mostly in romance novels and buddy cop movies. Two genres known for being high-quality, well-written, and full of dynamic, interesting, and unique characters. /s
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The quality of a summary reflects the quality of the novel. If there's a spelling error in your summary, I'm going to assume the story is riddled with spelling errors. If the summary is nothing but short, staccato sentences, I'm going to assume that your story has no variation in sentence length. If your summary uses lots of exclamation points, I'm going to assume you're 13 years old and your story is told from the perspective of your stupid Mary-Sue OC.
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Put some effort into the title too. I swear I've seen like five stories in the last year called "Love You, Hate You". I already know what your story is about because I've seen it before.
Most of the things that make me put a novel down have already been stated by other people in the thread. I just wanted to add on some stuff that makes me not pick it up in the first place.