Yes and in a large way. I greatly value the extra punctuation articles he writes. If not for Yahtzee I wouldn't have bought, and enjoyed, games like Shadow of the Colossus, Deus Ex, beyond good & evil, KOTOR, System Shock 2, ... I could go on but you should get the picture. I don't have a large gaming budget; I can't afford to give every game a fair chance to surprise me. Yahtzee does this and coherently informs me of reasons that I might like, or more often might not like a game.
I usually agree with his analyses, but when my budget allows I test thing for myself, I find that we don't have identical opinions. For example, I enjoyed Mirror's edge and believe that its faults(piss poor story, narrow+linear levels) did not detract from the experience enough to warrant a negative net reaction.
I didn't pay even a fifth as much as Yahtzee/the escapist did
I didn't notice any collision problems, possibly due to the patches released when I played it
I didn't mind flow breaking moments cause I had more than just a few days to play it and we able to replay until I could preserve flow, and it felt good to do the levels with continuous flow.
I digress...
So Yahtzee may not agree with you on everything, but he's a good guide for becoming a more sophisticated gamer(yeah I know I shouldnt use that term/label, so if someone wants to revise this go ahead) and a more logical, skeptical, and reasonable person. (Except if you enjot of RTSs, where his jurisdiction ends)
Thanks Yahtzee