I've run this game twice now, once with an official scenario and one of my own making which became a two parter.
The rules are easy to pick up and run with. There's a bit more roll play than role play with some of the mechanics but far from deal breaking at all. Nothing any GM can't work with, work around or fudge depending.
What is the most fun, and reason you should stop reading this and buy them, is the setting and mindset you and your players and put in.
You are the bad guys but based on who's perspective of bad? It allows you as the GM to put your players in interesting morally grey situations. The setting, the random tables and the Hatred mechanic all have you players making interesting choices about defeating Evil but "Are we the baddies?" Yes, No, errr? That's where the compelling stories lurk.
Even if you don't play the game itself, it's worth getting just for the ideas and resources you can mine from it.
Definitely worth the $9. It has been a real pleasure to run.