Sorry to break away from the archeological commentary.. 
Weirdly, something that would do me in as a player as far as breaking the believability of the Campaign World is something I do a lot of as a DM. It's something I'm aware of, and trying to change, but it's hard.
It's when virtually every NPC the players interact with (other than combat) are "infected" by a character trait of the DM. Let me explain.
See, I'm quite the smart-ass irl. I'm -great- at comebacks. And when doing off-the-cuff conversations between the players and NPCs.. It tends to seep in. And a campaign world populated solely by people who are great at comebacks, very sarcastic, etc.. Is hard to believe in. My players don't mind overly, 'cause it's usually pretty darn funny, and we play for fun, not really for deep character immersion, but still, it's something I'm working on. And once in a while, I'll indulge myself, such as when the PCs (at 3rd level) were dealing with a green Ancient Dragon. He -was- the ultimate smart-ass.
Weirdly, something that would do me in as a player as far as breaking the believability of the Campaign World is something I do a lot of as a DM. It's something I'm aware of, and trying to change, but it's hard.
It's when virtually every NPC the players interact with (other than combat) are "infected" by a character trait of the DM. Let me explain.
See, I'm quite the smart-ass irl. I'm -great- at comebacks. And when doing off-the-cuff conversations between the players and NPCs.. It tends to seep in. And a campaign world populated solely by people who are great at comebacks, very sarcastic, etc.. Is hard to believe in. My players don't mind overly, 'cause it's usually pretty darn funny, and we play for fun, not really for deep character immersion, but still, it's something I'm working on. And once in a while, I'll indulge myself, such as when the PCs (at 3rd level) were dealing with a green Ancient Dragon. He -was- the ultimate smart-ass.