I've found really interesting this post about game design on rampant games, discuss about choices in videogames.
In comments I've found good point on not good or evil choices but gray choices, because truth cannot be on only one side, so thinking about quest system I realize point is about choices.
So many games today give you so limited choices, mine too of course! Player is always in one path and all can do is follow my direction as game/level designer.
What do you think about open game systems and small choices?