I'm NOT commenting on your aesthetic preferences, if it is a problem, it is a you problem.
The diversity, well, he could have easily made them all 10's, create a space with "out of this world beauties". But, he dared to be different. To show that beauty has many interpretations and that one can find it in some unsuspecting places. I believe that in doing so, he elevated this game to a new status level. Maybe some people will feel it unnecessary, I, find it refreshing.
Obviously I still like the perfect 10's teenage male dreams with impossible bodies and levitating tits, sure, they are a cool fantasy. Yet, when this game introduced the "less than perfect" trio, I felt something different. I felt recognized. These are women we can cross on the street or when shopping groceries. These are the type of women that we end up lusting for, because they almost look real.
If for nothing else, just for the guts to do it, this Dev proved he's worth the recognition. It doesn't really matter that you find them ugly, because if you do, it will tell yourself something, and if you don't (like me) you'll learn something else.
So far, it is working quite perfectly, in my opinion.
Peace