Originally Posted by Maylander 
At the end it says: "Rating: 1.0 out of 10."
Not sure whether it's serious or not though. Sounds to me like he's merely unhappy with it and slaps the 1 on as a sign of that, not because it's actually a serious score.
If it is, it's not to be taken seriously.
Interesting - you are right, it is indeed there, but in invisible text (on my browser at least) I can only see the text by highlighting it. So I guess its not an official score, but rather an expression of intense personal dislike. Not that "unmitigated disaster" needs much additional emphasis