Violence against EVERYBODY is common in games (except children for some reason, apparently reaching majority makes somebody a more acceptable target for murder or something wacky like that) and I would say the male body count is far, far higher given games like COD. These characters are also flat and basically just there to be killed. This does not matter a bit, because it is just a game.
Most AAA games treat all NPCs like dirt, male or female. Say a few lines of dialogue, get killed, maybe respawn. I remember hearing that children had an unexplained immortality spell on them in Skyrim and finding friends a mod to fix this oversight, for which they were very grateful, but the unmodded game largely seemed to consist of mass murder rampages anyway and it seemed stupid not to include everyone in these. (Again, another game which I never actually played myself. I watched friends play it a few times, but was never really awed by it in any way to the point of buying it because of its undue focus on slaughter and general shallowness, even in the combat it was centred around. Punching somebody in armour with bare fists and only he gets damaged...no.) The only difference is the unnecessary sexualisation of female PCs and NPCs alike, especially in games like WoW. I agree that this needs to be toned down a bit, having seen the alleged female "armour" in some games.