Please take a look at this thread about Aegir and the grade that was granted to him by Anchor.
Basically, they graded him A when the general consensus amongst a vast majority of his owners was that he sucked.
So please consider that spreadsheet as what it is, a general guide made of the opinion of a few people with specific rosters.
It is a great effort and we all appreciate it, but in no way shoul be considered a dogma.
Try her, play with her, and make your very own opinion.