I used to be a costume designer for stage, and let me tell you, most of the women I worked on were not beauties when they walked through the door! It's the job of a costume designer and makeup artist to turn them into beauties, if that's what a script calls for. It's much more important to be smart, a quick study, and a good personality than it is to be a stunner.
The drawback to being a woman in entertainment is that there are fewer opportunities for women than there are for men. Women, on average, get significantly less screen and stage time when compared to men.
And, realistically, the Screen Actor's Guild has a steady 97% unemployment rate. At any given time, only 3% of its members manage to find work in their field.