These are the top things that stop me from critiquing a story, in no particular order:
- Poor formatting. Don't forget to double-space paragraphs or at least indent!
- I am very picky within that genre. Example: I'm a little prejudiced against some Science Fiction, but The Hitchhiker's Guide to the Galaxy was a hit with me. Why? The humor. I'm a sucker for out-there humor. But that's just personal preference. In other words, it's not always you; it might be me.
- So many grammar and spelling mistakes right off the bat that the story is either too hard to understand or makes me want to grab a red pen.
- Long paragraphs and super-long sentences can sometimes turn me off to someone's story.
- A poor hook. Though, I usually give things a chapter or so before I give up on it.
- Gore, rape, extreme violence. Again, personal preference. Even if I'm half way through the book, I might put it down because of those things.
- If someone wants me to start critiquing halfway through the story, I might do it, but ten chapter in... I probably won't connect with the characters or understand what's going on/worldbuilding, etc.
That's some of my list. I wonder what turns other people off to critting.