One of my professors in college said that the thesis statement of your paper was a like a bumper sticker on the back of a car. Short and to the point. He even called out thesis statements the paper's bumper sticker. Good teacher.

Your summary should be similar. The core of the fic and why someone should be reading it. Simple, straight forward, tells you what you need to know in as few words as possible, with no spelling or grammatical errors. Because if you don't care enough to get your summary right why would I believe you cared enough to do things right in your fic?

I will almost never click on a fic that has a summary that is a song lyric or poem quote. Not only may I not recognize what it's from I may have a widely different connection to that piece than the author and be coming from a drastically different place. You don't know how other people interpret things, don't leave your summary up to chance.

I will never read a fic where the author in anyway puts down the fic. Whether it's to apologies because they wrote it while [insert thing here] or that they think it's bad or even that they just suck at summaries. If you can't put the effort in then I won't either. If you can't believe in your work than I'm going to take you at your word and shrug my shoulders because if the authors thinks it's bad it really must be.