devs if you are ever going to make something like this features in game dont leave players and add meaning to the feature  http://www.youtube.com/watch?v=ejX0Rym0NZw (eve last trailer so dont cry about link)

there is the perfect example for a fail:
this NPC faction seek the revenge but all their revenge sum up to "go in place and stay there until players are able to form a zerg large enough and kill them" -purpose failed
there is supposed to be sandbox so if i want to destroy and help other destroy sandcastles i should have the freedom to do that, players cant join this "cyber zombie matrix" faction and help them, again players dont have the option to take a side

i hope this example of fail will help yo dev in the future

/rant off