AskMen's "Top Women" lists, like those of most mainstream American publications (ex: People mag, vogue, etc), are not to be taken seriously from the male perspective. As guys, we tend to expect a list of "top" women to consider physical appearance above all else because this is what we tend to do both in our personal lives and in our more impersonal observation of famous women. These lists go beyond that, and are designed to account for celebrity/popularity and a host of other factors (ex: "brains, ambition, charm", according to askmen) that men don't weigh nearly as heavily as women do.
In real life, most men simply don't select women for being especially ambitious or for having extra visible signs of intelligence (ex: Ivy League degree). They simply target women they find physically attractive. Once they have done so, these other factors may come into play as bonuses or (if a guy has many options), tiebreakers.
The folks creating this list (who may not all be heterosexual men, btw) were not selecting it the way a man would (physical appearance comes before consideration of intangible factors). They selected it in the way a woman would-intangible factors like charm and ambition are as important as physical appearance.
That is how women like Emma Stone end up in the top 5-she is perceived as more popular, "charming" and "ambitious" than many women, and this is supposedly enough to put her closer to the top than every woman who walked in the Victoria's Secret Fashion Show a week ago.
Does that sound like nonsense? Not to most women. Few men would rank Emma Stone (or Rihanna, for that matter) ahead of
any (much less all) of these if given a free choice, but the list is not designed to comply with the masculine way of seeing things.
Do not be fooled by the name "AskMen". Not all of those responsible for that site's content are male (or heterosexual), and not all of the audience is actually male. Women tend to be over-represented when it comes to media/advertising consumption, which is why their perspective is more well represented on television and in other forms of mainstream media. They simply watch and buy more stuff, and that equates to power.
I just ignore these lists, and you should too. They'll never make sense from a male's perspective because they don't need to-the female view of the world is the profitable one.