The only time I'll ever really agree with Yahtzee is when he rips on a game I have actually played before, and especially so if he points out the annoyances or problems that seemed to bother me. Not to say though that I agree with all of his points on those games either...
As for the ones that I haven't played yet (mostly all of the ones he's reviewed) I just watch with an open mind and for entertainment. If he considered it extremely bad, and I was thinking of getting it to try it, his opinions will more than likely cause me to research other reviews and aspects of the game before I either skip it or go and buy it (since I can't really rent games anymore thanks to this shit economy closing all the movie/game rental stores >:C
As for the ones that I haven't played yet (mostly all of the ones he's reviewed) I just watch with an open mind and for entertainment. If he considered it extremely bad, and I was thinking of getting it to try it, his opinions will more than likely cause me to research other reviews and aspects of the game before I either skip it or go and buy it (since I can't really rent games anymore thanks to this shit economy closing all the movie/game rental stores >:C