I'm a transposed Hollywood professional. I now have a script consulting service. I help people improve their scripts and seriously prepare their material for the marketplace. Most of my clients are really happy with my work. I have writer clients who are very grateful they made one more stop before marketing their material.
Good notes can make a huge difference.
If you want me to read the revision, I'll give you a third off. I can sense it strongly when a story's off. My notes are carefully rendered. I'm very aware how bad notes and mis-cues can mess a writer up. I'm close to my feelings.