Yes, people judge women on their looks more than men, but what it really comes down to is sex appeal. The general public want a president with some sex appeal. That’s why Dole had no chance and the viagra ads were so apt.
We perceive women differently, so it is normal to wonder the effect. Women can get public approval for sex appeal easier than men, and therefore their character may be less scrutinized. But when the looks aren't there, will she need double the substance of a man? She can't really rely on the folksy stuff because she risks seeming weak and too nurturing or emotional to make tough decisions. I don't know. It may not matter. But it is a reaosnable question to ask.