Whether ratings are "correct" or not depends solely on the person who is viewing them. Some people might like one model, but others wouldn't.
As far as I can tell, the ratings are different over there for two reasons.
1) Only members who owned the cards on SS2/VG2 got to rate them. If you didn't have the card in your collection, you couldn't rate it. Here, even people who have never even downloaded a free trailer can rate a card.
2) Also, the cards on those sites were an entire girl, the equivalent of 5 cards on VGHD. This means that here, the rating is only a reflection on the show, not the girl.