Here is a sample post for a new Category of the Forum for Reviewers.
Barron of Ideas here. (Not barren of ideas). I just read another review with N/A where the numbers should or at least could be. I feel that shirks one of the reviewer's tasks. Tell us what you think, and quantify it. If you want to give a 6.5 but rounded up to a 7 say so, and ideally why.
If you have a reason for N/Aing a particular score say why. Dyslexia or English as a second or third language could be a reason not to score Technical. If you decided to write a review, why not tell others what score you give the story. Keep in mind scores below six raise the question why review this story? A review recommends the story to others. A ten says a lot. A six maybe not so much.