If you mean in terms of the atmosphere and players trying to get as close as possible to the mindset of a medieval person when they're playing their characters, again, it varies from realm to realm. And from player to player.
Of course, what 'medieval' means is also different from player to player. Some will put a lot of importance on concepts like personal honour and loyalty within the feudal hierarchy, while others will take a much more loose and modern approach to it. But, hopefully, everyone should be making some sort of attempt to play as 'medieval' characters, since atmosphere is 90% of what makes this game different to a thousand button clicking browser games.
