I give this movie an eight for the concept, but a four for the execution, and I'll tell you why in a minute.
First, we liked the actors and thought the leads did a good job. The overall story idea was clever, and as an author, I particularly like movie ideas which include writers. And yes, sometimes an editor can help an author identify issues in their plotting and seriously improve a manuscript.
Here's the other side. Last year I wrote a murder mystery, and over the last two years I've been writing a series of RomComs, so I've kind of got my elbows down in that type of work. They say the guy handles his romance relationship all wrong, and the editor is going to help him improve that. Fine. What they missed were any DETAILS to make that trope more real to the viewer.
In the far superior Trading Christmas, a woman helps a male author with the relationship in his manuscript and what's wrong with his female character, and they at least talk about it enough to understand where the author was going wrong and how to fix it.
None of that here, I'm afraid.