Yes and no. His style allows him to be as biased as possible, so when it comes to certain games, you have to listen to what he says about the game, and not the comedy, to get the goods from him. Recently, his reviews were quite lacklaster, in my opinion.
My problem with Yahtzee is he refuses to accept that some people buy games based on Multiplayer, while hes a "I buy games based off Single Player" kinda man. That, and if its not Yahtzees cup of tea (aka its popular, a JRPG, etc.) then he is relentless towards it, even if he is making weak excuses.
Also, Extra Punctuation usually is Yahtzee trying to act smart. He makes good points, but more often then not, his points suck. Hes a good entertainer, and has some good views. He just has bad ones too.