For any sort of moderated story, you have to be judgmental; otherwise it would be public. That being said, I don't have high standards. I like to let people go their own way, tell their own story how they want to tell it, explore whatever characters or kinks they want to bring in, without interference. For me, that's sort of the point of CHYOA. The ability to go left instead of right, to take the path not taken.
The rare time I turned down a chapter, I have offered feedback as to why. But if I approve a chapter...it's because it's good enough. I don't feel the need to go into it. I might not even like the chapter, it might not speak to how I view the characters or any kinks I care for. But if it's competently written, and the writer obviously has something they want to explore, I'll approve it whether I like it or not.
I might feel differently if a story was deliberately set up as a collaborative effort from the start, where I was alternating chapters with someone and we needed to keep in communication. But for the most part, I assume that folks who add chapters to an existing story want to write their own branch, or want the story to turn a particular way, and that's all part of the game. Most chapters don't get praise, most just get by. There are thousands of chapters without any comment or like at all.