Simple, easy to run, easy to play, and full of drama! The simplicity of the rules belies how complex the scenarios can get, as you juggle the agendas of other players, NPCs, and natural (or even extra-natural) events with your own goals!
I've gotten to play a few campaigns of Factions, and most games tend to have not only a large, overarching narrative that involves everyone, but each player naturally develops their own side-story that ties into the main narrative in all sorts of unique and interesting ways. Practically half the fun is the anticipation of finding out what everyone else was up to behind closed doors! Strongly recommend, works very well as a lite play by post game to have going with a group of friends in the background over a long period of time, and is a great way of keeping friends without a lot of time on their hands close.