Yes it is, it implies that physical looks matter at all when fundamentally they don't. You should never judge anyone based upon their looks. My above post has been fixed somewhat. See what you think of it now.
I still disagree with your view.
1. Nobody is rating anybody. It is a fact that Litvak made ace and that didn't changed much about the LW perception of women.
2. It is also a fact that the nightwitches made quite an impression on the germans, but mostly because it takes a lot of guts to fly night harassment missions on Po-2 biplanes.
3. We can comment on people looks without loosing objectivity on their abilities. If I recomend a woman doctor to a friend because I think she is a good professional and casualy comment that she's also quite pretty, it would be wrong to assume "he only thinks well of her because she's good looking" and try another one. I would vote on Anna Yegorova as the greatest woman pilot of WW2, and that has nothing to do with looks.
4. It is perfectly normal to comment on people looks. For example try discussing US football (soccer) goalkeeper Hope Solo with soccer fans (male or female) without discussing her looks. It's biological.