It affects everything in the way we see wow. Look at the female orcs and humans for example. The female orcs are ridiculously thin by orcish standards, because to be anything else is considered unattractive. Female humans are dangerously thin, as well as blood elves. Male humans have been joked about for the fact that they are more muscular than any normal person can realistically be without having a life dedicated to body building.
Then we come to issues like the female worgen, which was not considered sexualised enoughby players, and Blizzard decided to make them more pretty, give them bigger boobs and slimmer waists. I admit, I am happy that the pandaren are reasonably attractive, while also being almost as large as male pandaren. If the female pandaren were as thin as tauren, I would certainly be very irritated.
If you look at lore characters, such as Valeera's hearthstone image, no one can argue that she represents a real woman in any way. Massive breasts, and clothing that... emphasises them. Completely revealed legs, supermodel waist etc. This is a theme that carries through most female lore characters of races such as humans and elves. Jaina, sylvannas, etc.
The men are also extremely sexualised. Try and find me a popular male lore character that isn't ripped out of their mind. Difficult, isn't it? I have yet to see an orc that isn't like this (apart from super old ones). Even Gul'dan in the warlords wallpaper is supposed to be wasted away but he looks pretty ripped to me. Tauren, humans, trolls, worgen. Despite the fact that most people in lore aren't adventurers, they are ALL super muscular or super thin with big breasts.
Of course, you could be one of the players who considers wow to be something where this sort of fantasy is healthy, and want more of this sort of portrayal. I would like to hear your opinions.