I think this would be a good way to approach the issue of identifying things that everyone needs to work on, without having to criticize specific works. My biggest turn-off: bad mechanics. I'm not talking about the occasional spelling error or verb agreement flib - even I do it sometimes. I'm talking about things like punctuating dialogue properly, consistent capitalization of names, appropriate use of commas. It's just incredibly distracting, and no matter how strong the plot may be, this kind of blemish on a story makes it unreadable. I also have a small pet peeve with excessive use of italicized thoughts in a third-person story. That applies to basically all fiction, though there are some that make up for this narrative cheat by strengths in other elements - Jordan's "Wheel of Time" comes to mind. Unnecessary and gratuitous torture is also a no-no in my books. I steer clear of those. Your turn.