Do you voice concerns about grades with teachers?

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I haven't slept all night last night because a comment that one of my professors made disturbed me. I didn't think that her grading was fair and her comment, where she pretty much said that you cannot receive an A for a subjective paper, bothered me. It especially bothered me since the assignment was to write a personal statement. She's a substitute professor for the rest of the semester because our original professor decided that she couldn't deal with the course and got a replacement for us. It's really bothering me because when I did my assignment I did what the first professor told me to do but this new professor graded it according to her own standards and I got a grade in the 80s when I know I could have gotten in the 90s had the other professor graded my paper. Because I couldn't sleep I got up out of bed at 5 in the morning and voiced my concerns to the professor in an e-mail. I let her know that I thought that the grades were unfair but I explained to her why. I'm afraid that she will misunderstand what my intention of writing the e-mail was because I was not trying to be rude. I wrote it in the most respectful way I could and showed that I understood where she was coming from as well since this is her first time teaching college. This is the first time that I've e-mailed a professor telling them that I did not think the grade I was given was fair. Have you ever been in a similar position? Did you ever tell a teacher that you didn't think the grade you received was fair, what was their response? Or, have you held your tongue because you were afraid that speaking up would affect your grade in a bad way?