I tend to think it's more a problem of quantity rather then quality, I think it's more to do with how the person is raised in our society and how just socially boys are more inclined towards gaming where as girls are more inclined towards other things; a more social stigma then anything.

But with that being said the quality of the girl gamers even though they are in smaller numbers is really good; actually, even girls with really bad video game coordination seem to have a way of beating me at games, ecspecially arcade fighting games.