ElvenPath made a format for reviews to be posted in the suggstions forum. I suggest you check it out
Oh, about the scores, there is only one score for bad for the foloowing reason: People that don't like an anime will most likely not finish it. So most reviews which are classified as bad will most likely be based on a limited number of episodes. Therefore I don't think there is a need for more "bad categories"
http://forums.animesuki.com/showthread.php?t=15078
So go ahead and review something
