Shao Kahn playable? Holy ****ing shit i'm angry. Bosses, although a cool prospect on paper, never pan out in the long run especially online. In our online dominated society, it can't be afforded to have one character completely ruin an online scheme that is meant to have 26 factorial ways for a fight to happen. If we have an overpowered boss (a high possiblity) and bad netcode (also a high possibility), what would stop every user out from using him just to boost? Negs on rank for those who pull simply because of the inevitable loss? You'd be rewarding players who lack skill and those semi-good players who seek to better themselves by fighting every type of player (the turtles, the defensive, the aggressive and the tactical) lose this option by losing all options but to fight aggressive players with Shao Kahn. And then the adage, "If you can't beat them, join them" will come into play and then what? SFIV all over again (not boss wise, but rather single character domination online).
The only appropriate counter for that is to travel offline to face players to better yourself, and in this economy who has the ability (read, "time and money") to travel far to search for ample competition?
I'm aware this is all potentiality, but it is a realistic view of what can happen if one unbalanced character is introduced into a game. Just one!
Additionally, for those seeking fun, although some may disagree, it is generally agreed that "Winning is fun". Simply playing the game will be fun most of the time, but once online becomes dominated by the guys who are having fun causing losses to everyone, it'll just become frustrated and people will quit using online.
And if it is, "just a game" some people do and can take gaming seriously because it is their choice,
as said in the UN declaration of Human Rights:
"All human beings are born free and equal in dignity and rights. They are endowed with reason and conscience and should act towards one another in a spirit of brotherhood."
/Rant Off