I have found scoring rubrics to be very helpful for me as a parent of children in school, as an employee, and as a student myself.
The time spent on establishing a scoring rubric is time well spent. There is nothing more frustrating than getting a score on an assignment and not knowing exactly where you need to improve.
I believe that it is also helpful for teachers when it comes to grading. They have an established guideline in helping them to analyze the assignment and give good feedback to the student.
It is also helpful in the workplace to know where you need to improve. You don’t have to guess where the problem is and you have a better idea of what goals to set for improvement.