I love fanfiction. I find the intricate stories people can produce based on television and movies fascinating to the point of obsession. Some of the people out there can write exceptionally well, while the rest...well, let's just say that there is a lot of work that needs to be done (this goes to those with poor grammar, zero punctuation, and no knack for storytelling).
However, there are a few peeves as a reader. If people are lazy enough or poor enough writers to do this then I will refuse to continue reading or even start a story.
1) First and foremost, FINISH THE STORY. Leaving a story for a year or more without a single update is ridiculous. I know real life is busy, but I mean really, A YEAR! What's worse is some of the stories doing this are some of the best with the story just dying off. If you've written a story that has 185,132 words in it, then it is not the time to just leave it alone. I've invested my time in your story and I expect a resolution. (This is a shout-out to a particularly good story that hasn't been updated since 2010)
2) "This story's great! Read my story! I can't write a summary very well but it's better than it looks!"
...Yeah, and I'm the Queen of England.
3) Some punctuation errors I can stand, but my goodness if the entire story is a run-on sentence, there are no paragraphs, or any hint of a grasp of the English language (for the English stories) then for goodness sakes take a class!
4) Any story where you try to add new brothers, sisters, insert self (:/) will not be read. 99% of the time they're craptastic. Especially when people put themselves in the story.
5) Crossovers can be an exceptional experience if the stories are developed, but there are some that just don't work. Be careful about which series you match and which characters you try to put together.
6) I'm not the biggest fan of slash fiction. It has nothing to do with being homophobic, I just don't swing that way in my reading, especially when the cannon characters are straight. I prefer to read stories that follow the character's personalities. However, I am aware there are stories out there that are exceptionally written, and some terrific writers have made the jump to try it out. Keep up the good work guys. However, if you're going to write slash, please, please don't make it incest. I get the fact Jensen Ackles and Jared Padalecki are good friends in real life, but that is no reason to commit incest in a story based on the show. They are brothers that are close because of life experiences, anything more is just weird.
7) Updating and then not checking your email or reviews in a while is an issue. There's a story I'm devoted to that was updated recently, but the chapter was a duplicate. I sent an email to the author over a month ago, but there was no response. Just think, there could be a chapter out there waiting to be published that wasn't.
8) Moving your story to another site is, of course, acceptable, especially if accessing the story is easy and a link is provided to the new location. However, transferring a story to a site that includes comments sections after every chapter that requires me to scroll through dozens of commentaries is frustrating, and the experience does not make for a pleasant read.
9) Posting an apparent new chapter that states you'll be posting an actual chapter in a week, and then not posting for a month or more (or just not posting) is not cool.