I enjoy stories that challenge preconcieved nottions about things (people, ideologies, history, etc.). As a GM, there's nothing I enjoy more than smashing my PCs preconcieved notions about a story elemet. We recently played a Babylon-5 adventure where the PCs had to infiltrate a cell of the Free Mars terrorist organization. They were expecting a bunch of rather stereotypical "crazy terrorists". Instead - I unabashedly ripped off part of the story line from Les Miserable which I knew none of them had seen and they were confronted with a bunch of disorganized college kids who saw themselves as liberators attempting to overthrow the oppressive Earthgov. Stories like Game of Thrones, Harry Potter, and The Full Metal Alchemist (which my players are all fans of) - have meant that I had to up my game as the GM and bring a lot more political intrigue to the party. When we were kids, we enjoyed smashing the orcs and piling up gold. As we've gotten older the campigns have become much more politically motivated. Smashing up orcs (or mechs) still works when we don't feel like thinking too hard. My larger point I guess, is that if you're going to make an M-rated game for people who played a lot of D&D when they were kids, I'd expect most of your older players to appreciate the political machinations more than the kids who will likely be playing the game in spite of the M rating. My players enjoy the opportunity to be heroes (or anti-heroes like Clint Eastwood). They prefer obvious moral delimmas (opportunities to behave good or evil) to moral delimmas where the outcome is ambiguous. They dislike choices between two or more equally bad outcomes (you can save the father or the mother but not both). They enjoy being able to set factions against each other. And as they've gotten older they enjoy playing weaker characters where they're awareded for more creative gameplay. One adventure, they were too weak to kill ogres digging up the graves in the graveyard so they came up with idea of bathing in whitewash, pretending to be ghosts, and attempting to scare the ogres away. That was totally not a solution I had come up with, so I gave it to them.