I'm not really worried about it, but I am rather confused...

Not giving a rating in Humor I can understand. But what I don't get is why someone would play the game, give ratings in Innovation, Theme, Audio, and Mood... and not give ratings in Overall, Fun, or Graphics? (Especially Mood, since that's so ill-defined as a category... I would expect that to be the most likely for someone to skip.)

How strange.