Whats a 6/10 for face for exemple... it may hurt a girls view of herself, when if you would had just said "she was pretty, but not the best looking girl i ever saw" it would had look a lot better.
Anyway, maybe im too sentimental but oh well...
I don't think you are too sentimental, you are just being considerate and showing that you care about the feelings of the girls.
However, reviews and ratings are part of this business, and a girl needs to be self-confident enough to be able to handle both.
I do agree that the numbers are vague if they aren't accompanied by an explanation of what they mean to the reviewer. On another board I am reviewed on, number ratings are mandatory as part of the reviews, but each number is associated with a description of what that number represents. On a board like merb, where the reviews are free-form, a number rating that isn't qualified by a description is much less meaningful.