There are tendencies that teacher given subjective assesment more than objective assesment as an impact of personal approach of teacher to students that came to like and dislike as a person.
One of the way i use is to create a rubric of objective assement with a proportion of number eg table of objective assesment on presentation you get 80-100 if you have a clear presentation,easy to understand and interesting for instruction criteria.
Can you share me your experience and opinion?