Yahtzee doesn't annoy me, the people that take his 'reviews' seriously do.
Now i don't usually make a fuss. His Monster Hunter review was very opinionated and didn't stretch beyond the tutorial. THAT didn't bother me, but when i looked at the comments and saw 100's of "10 hour tutorial?" and "wow, i'm never buying that trash", that's what i'm using as rant fuel.
Basically what i see there is people refusing to buy a decent game because the tutorial isn't very action packed.
I can't say whether his other reviews have caused similar situations but i'd hate to see people missing out on other great games because of him.