Well, I keep in mind that it his Yahtzee's opinion and that he may be, at times, a bit too harsh on games. I, however, take it in consideration when he praises a game, exactly because it is a rare occurence. Nevertheless, it's his take on the games. People should just think about it, not take it as a absolute truth.
Also, not everything is black and white, y'all.
On a side note: while Yahtzee is a bit harsh on games, whenever he makes remarks about the plot of a game, he is mostly right. It's just that many people completely overlook that aspect of gaming.