Naw, it's just a larger game of Black Crusade/D&D/Pathfinder etc. but the values are already put into the digital game as macros. ... And a slightly more complicated story/background, but that highly depends on the GM with most PnP games.
Actually not really. For example, I want to say what my character is doing. I type: ; goes up to the bar and orders a stout, giving the 'tender a saucy smile and a seductive lean. Looking over her shoulder she calls back to her companion, "Hey, Braden, what do you want?" then places his order as well. The game will display this on the other players' screens. Jinx goes up to the bar and orders a stout, giving the 'tender a saucy smile and a seductive lean. Looking over her shoulder she calls back to her companion, "Hey, Braden, what do you want?" then places his order as well. And to roll it's just +roll Stat +stat +1 or whatever and it rolls it for you. See? Simple. You're kicked out of the geek club forever and ever. They are Pen and Paper, or table top role playing games.
There are no macros in a MUSH really, just a standard set of commands. Macros are used on the roll20 website for roleplaying.