I'll admit it, he's seldom changed my opinion about games I know I'm gonna get anyway.
(UG - how to describe what I'm thinking in a way that makes sense.)
Yahtzee is an odd fellow. You don't have to agree with him, you don't even have to like him; but you have to admit, he THINKS about what he's going to say. He has a solid head on his shoulders, and he's not particularly afraid for his job or what his PR department is going to say. He has a sort of Eric Cartman, "Ah do what I whant!" vibe about him.
What I'm trying to say is regardless of whether or not I agree with him, I value his candor, and I value his opinions, because at least he takes the time to form them reasonably well. A good review these days is a rare thing, open any video game mag and flip to the review section, you'll probably get six page coverage of the games everybody was already going to get, and 1 paragraph coverage of the games you might actually like to know about. Yahtzee tends to cram allot of information into a funny five minute video, I get more out of Zero Punctuation then I do out of all my magazines. So yea, I don't agree with him from time to time, but that's fine, I don't need to agree with him - I like ZP anyway.