You are not alone. I also thought that RM would be quite gameable as a setting.Lots of good answers, so I have two bad ones:
1) I know I may get beat up on this one, but I would love to see that setting bible that was supposedly written for Rebel Moon. I know the movie had its problems, but I thought it was overall kind of neat.
As for other properties...man, where to beginn?!
- Malazan Book of the Fallen - Steven Erikson
 - Prince of Nothing - R. Scott Bakker
 - Sunsword - Michelle West
 - Arcane - NF Series
 - Alchemy of Souls - NF Series
 - Berserk - Anime/Manga
 - Claymore - Anime/Manga
 - Echoes of Empire - Mark T. Barnes
 
If only the people behind those properties had realistic expectations as to the amount an RPG can make. Oh well...