Jujitsudave said:You may have a GM that is willing to run the setting but is not experienced with it. Meanwhile you may have some seasoned players who know Glorantha. How do you run a game like this?
"GM: So the Grand Poo-Bah of the God Learners wants to invite you for tea and metaphysical discussions....
Player: Um, GM, I don't think Sizzlechest of the God Learners would do that. He's more likely to steal his soul on the spot and......."
In my opinion, these players are being rather rude and they don't like to have fun! If you respect the effort that the GM has put in preparing the session and the GM has read the background information about the place where the action is taking place, I think that's enough. I mean, your GM's Glorantha will vary. I don't think that I, as a player, won't have fun if the GM hasn't read as many books on Glorantha as me. I think extreme background-orthodoxs like these players are thankfully hard to find, and they are laughable anyway. :roll:
If I were the GM of your example, I would tell the player that I'm not forcing him to play in my Glorantha, so either he accepts the Glorantha I know or he has to look for a GM that has read as much as him in another place.

And this type of player could happen with any other world, not only Glorantha. If players have common sense, this case just doesn't happen.