Yeah - one: No More Heroes for the Wii. At that point I hadn't used the Wii for ages, so I was looking for a game to try.
I don't fault him for liking No More Heroes but that game was NOT for me. Hack'n'Slasher's rarely are the sort of game I like, so I should have given it more thought before buying it in the first place. NMH is a good game, if you happen to like that sort of gameplay. I don't.
Aside from that, no - he hasn't caused me to buy any games that I wasn't already going to buy. For that matter, he hasn't prevented me from buying a game I was going to buy. His commentary is interesting, mostly insightful, but he's his own person, as I am my own person. I like different things than him. Simple as that.