Seven Swords was designed as a fully cooperative game with victory and defeat shared between players. There is no need for a single player to control the monsters, as they have a built-in engine and rules that they follow. The game is tuned to be fairly challenging and requires a good deal of smart gameplay among all players to achieve victory. The game also minmizes alpha gaming (one person making decisions for other players), as a lot of decisions are made with imperfect information, and are made simultaneously with other players.
I have been an enthusiast of cooperative games for a long time, and I think there are a number of things that make a good cooperative game that I have tried to incorporate.