There are 5 parts to the overall rating instead of 6, since Graphics are not an important consideration.
Game Design is now worth 30% and Challenge is now worth 25%
I think that these are the main parts of a text based game besides story; however, I do not grade the story because a game is not a book. A good story does lend itself quite well to the overall enjoyment of the game, so the 30% of the Satisfaction/Fun takes it into account.