It is decent way to praise every woman. However, seldom men will approach not good looking girl in street or lab. men in world are same.
but western don't pay much attention to other's views, if they think girl have other merits to compensate their outlooks, they will go out with her.
Not like many chinese men pay too much attention to "mian zi".
泡鬼子之一 (From bbs.mit.edu)