Game companies make characters that appeal to the people who play their games. The games you are describing are mostly played by guys. (most "hardcore" games and online shooters are for mostly guys and you know it, don't even try to argue it). Therefor the characters are either young male kids that are like them (sometime angst young male kids to appeal to broody teenagers) or buff idealizations of a possible future self that they aspire to(kids who play Gears of War have an odd idea of ideal self because they are young... and stupid). If you want strong female leads you will need to find the area that is most heavily populated by females (I'm going to show my blind ignorance and say casual games, correct me if I'm wrong please). Of course there is a strong base of female customers in more casual games but these games are generally simple and straightforward enough that well defined characters are not necessary. You don't need a strong and well characterized female to sell say peggle, bejeweled or even plants v. zombies. On top of that, these markets tend to be catch all that used more gender neutral characters in order to catch all possible groups rather then just one so creating elaborate female characters specifically doesn't happen.
In short, games that will will come in contact most often are played by dudes and thus are represented by dudes. A stronger Female player base would change this but girls seem to inherently not be draw to gaming(this is a general trend, don't kill me ladies!).
In short, games that will will come in contact most often are played by dudes and thus are represented by dudes. A stronger Female player base would change this but girls seem to inherently not be draw to gaming(this is a general trend, don't kill me ladies!).