20 points writing had few errors/typos; few grammatical errors

(Example essay)I was reading about a game similar to the courtship game in chapter 11 which made me realize that I needed to propose to my then girlfriend (and now wife). No, it was not motivated by the desire to “be intimate” as the book suggests…let me give you a bit of a background.
Erin and I had been dating long distance while I finished my PhD and she finished her Masters. We were living together in Florida, where we both had family and the support network of our friends. I had accepted a job at Penn State and wanted her to move to (the middle of nowhere) Pennsylvania with me. She did not have any friends or job prospects in the area at the time. Since we were “just” boyfriend and girlfriend at the time, she may have been concerned that she would make the move and then we would separate.
In the Courtship game, the woman is worried about her reputation if she has premarital sex and then ends up not marrying the man. In real life, Erin was worried about how her future would be compromised if she moved for me and then we separated. My costly gift was getting married before moving (even though we had a small ceremony and there was no diamond involved). If I intended to only use Erin to help me get accustomed to my new environs then move on to another relationship, then getting married would be extremely costly for me (well, the divorce part would be costly). Getting married gave her the assurance that she could move to PA with me and begin to look for jobs and plan a future with me.
Criteria Rating
Writing, grammar, clarity
20 points Writing had no grammatical or structure errors
20 points Writing had few errors/typos; few grammatical errors
15 points Writing included several errors/typos; grammar was fair
10 points Writing was unclear; grammar was poor
5 points
Proper formatting; length
10 points Proper formatting applied, long enough to explain fully without droning on.
10 points Writing somewhat short or long; most formatting applied
8 points Writing too short or very long, some proper formatting applied
4 points Did not use proper formatting; Writing much too short
1 point
Answered questions; followed guidelines
50 points Particular game theoretic concepts properly discussed, particular future uses elaborated upon
50 points Particular game theoretic concepts properly discussed without specific future uses
35 points Specific concepts not applied or student does not understand concept; tries to apply to future uses
20 points Incorrectly interprets game theoretic concepts; does not apply to future
5 points
Organization
20 points Writing was well organized
20 points Writing was fairly organized
15 points Writing was poorly organized
10 points Writing showed no organization
5 points