Some times I get angry, but not directly because he trashed a game that I liked. I think he has some humorous content, and I usually enjoy his videos. However, I feel that the majority of those videos are far less review and really just a series nitpicks. He really just doesn't give the games that he's 'reviewing' a fair shake. Furthermore, on several occasions he's been flat out wrong concerning gameplay mechanics/story/etc.. that he's ranted over.
Still, all of the above doesn't really get me upset. What does irritate me, though, is reading the threads for each video and seeing just how many people accept his comedy show as a legitimate review. It's a shame to see some people missing out on genuinely decent games only because Yahtzee decided to emphasize a few sour points.