I love almost all of the Scarred Lands stuff, but Warrens of The Ratmen left me kind of cold.
It seemed to follow the all-to-familiar pattern of the World of Darkness sourcebooks.
It listed the different Ratmen clans in much the same way as The Vampires of the Camarilla, the Werewolf Tribes and the Mage Traditions are listed in their respective books.
All told it's "Fine" I guess, it's just in such astonishing company when placed alongside such supplements as Hollowfaust, Burok Torn and the Ghelspad Gazetteer itself thjat the bar is set pretty high.