For example, in WOW the characters are idealized. This is true for both men and women though as the women have a perfect hourglass figure and the men have broad shoulders and are outrageously muscled. So muscled, in fact, that their arms and hands are freakishly large and inhuman. Nobody sags, pot bellies are nowhere to be seen and even the elderly have the breasts of lingerie models or the biceps of olympic weightlifters. In fact I find that the female characters seem a lot more appropriate for caster classes than male ones because somehow it feels wrong that a male warlock who wears cloth and carries only a dagger has arms big enough to crush skulls with; in the same way the females look strange as melee classes because they have normal arms wielding 2 meter long swords. The real difference comes in the clothing. Put the same gear on a male and female character and you can often see a big difference in how much skin is showing and obviously the female is always the one wearing less.
I don't have a personal objection to this to some extent; I happen to like females unclothed so when I see this sort of stuff I wish it went both ways rather than wishing for the women to be covered up. I don't mind eye candy for those who like undressed men so long as I get my eye candy too! The thing that does get me frustrated though is the utterly ridiculous and immersion breaking sexifying of women in games, particularly high heels. I understand the basic principle of high heels in real life; they change the shape of women's legs in a way that appeals to most men. (I have no idea if it is as appealing to most women who are attracted to women.) High heels are awful things in real life where the people wearing them walk around on sidewalks and sit at desks; they are not appropriate at all for adventuring! Both the female demon hunter in D3 and many of the female heroes in Mass Effect 2 wear high heels all the time and it looks utterly silly. These are characters that plan to run from cover to cover, leap over objects and dive away from explosions and they choose to wear 15 cm stilettos? Preposterous. Even more so it is *easy* to change the shape of the legs of these women to be more appealing without adding the idiotic footwear! Women in real life can't do that but there is no excuse whatever in video games for adding in action heroes wearing heels except to objectify them.
Miranda pic from http://masseffect.wikia.com/wiki/Miranda_Lawson
Arnold pic from http://tonightatthemovies.com/indexhold/?p=14365