Well...their female leads have mostly been the potential eyecandy type. Just off the top of my head:
D2: Sorc, Amazon, Assassin. Not exactly ugly fat chicks.
D3: Not so clear here, the female WD, Crusader and Barb aren't exactly models. The other female classes are quite standard.
WoW: Jaina, Sylvanas, Alexstrasza, Tyrande, etc. Provided they are human enough to judge. Even Maiev her skin without the suit of armor is that of your typical pretty lithe elven woman. In general most female key characters in Warcraft have been strong, yet beautiful women. Yrel, Ysera, Liadrin, Vereesa, Azshara in elven form. Hell, even Garona has been redesigned from your average looking (half) orc female to a pretty thing.
Not saying it's gamergate or all that crap, but I don't really see the large variety you talk about. There is variety, for sure, but I do feel like most major female characters are potential models