Lots of fun. Without discarding most of the Nagahs' own rules, it's nigh-impossible to run them in a "Werewolf" game, but, on their own, they can be great. Play can involve lots of investigation. If you like forensics and shows like "Cold Case," "The New Detectives," "Law & Order," or "CSI," this book is for you.
Or you can throw all of that out the window and just have the snakes kill targets. Whatever. :)