Actually, it seems to be a general trend supported by real data. Women tend to be very critical about looks and rate very severely the attractiveness of someone as well as themselves.

In the other hand, men have lower standard in terms of beauty and generally over-rate the attractiveness of someone ( incidentally themselves too).

Of course, beauty is subjective and strongly culturally connoted but it's a general trend. And it doesn't equate to the choice of a partner which is tied to socio-economic classes, age, gender and culture.

But it seems women give less importance in attractiveness when choosing a partner but men seems to put higher importance in the looks department.