I really can't stand it when people write, "this chap sucks lol i hate it but plz r&r!!" No, shut the hell up. Don't post something you're not happy about. Go back and make the effort to fix it.
Also, if you're working on a multi-chapter story, don't post 200 words per update and drag out one scene over ten "chapters." Nobody cares if you UPDATE DAILY LOL if you post three lines of dialogue and call it a chapter. It really breaks the flow of the story.
Regarding the rape issue, I have read good fics that included a main character getting raped (not in the Miami fandom though), but in general, I'm against the whole boo-hoo, I'm a broken girl who needs a guy to pick up the pieces for me thing. As if the show doesn't force-feed us enough of that (I'm looking at you, season 4 Natalia Boa Vista).
Another thing that is so UGH is simultaneous realization. You know what I'm talking about. Eric and Calleigh both realized at the same time that they were in love simultaneous in the exact same moment together. No, I can assure you, they didn't.
And yeah, if I see one more story about Callie/Calliegh or Yelena/Yellina, there's gonna be a bloody rampage.