On some level, roughly 95 percent of games have always been about assassination: go to point A and kill prominent entity B, fighting your way through goons C through Z to get there. Most games tend to come up with a morally justifiable pretext for all the violence, but more and more, we're seeing games that drop the act and let you be what you've secretly known yourself to be all along: a remorseless killing machine bent on destroying your targets.