Tl

r at the bottom.
If he genuinely seems to think a game is bad, I'll take note. It'll probably be in the form of an agreement since by the time I watch the review I've probably already decided whether I want to "buy it now", "wait till the price drops", "wait for game of the year" (looking at YOU, fallout 3&4), or "do not buy"(MMORPGs)
If he seems to think a game is extremely good, I'll likewise take note- chances are I missed out on a great game before through not hearing about it or simply it not appealing to me at the time.
I'm fairly sure I played Knights of the Old Republic because he praised it somewhere. Actually, I'd been thinking about playing that for a long time, because I missed out when it was new and wanted to see why all my friends that'd played it were singing quite so many praises. Turned out that for it's time it really WAS as good as they'd said. But I digress. I'll obviously take more notice if he likes the game and can't find too many (or major) flaws. Because that goes against his job. Example: Dragon Age: Origins. He liked it, but had to rip into it, so he did. Still managed to tell us how much he liked it, and that did make me think "maybe it's worth getting".
Hell it's a bioware game I was going to buy it anyway but the point I'm flailing uselessly in my attempts to explain is that his review made me buy it sooner. It got upgraded from "wait for goty edition" (my default reaction to games that are heavy on downloadable stuff since it will usually include them all) to "buy it now".
There's also games I will never play no matter how great anyone says they are. I've hated gears of war ever since first playing it(mostly because it was based on cover-based-shooting), and since then have avoided cover-based shooters anyway. The sheer amounts of narm redeems it somewhat but the CBS just hacks me off too much.
If yahtzee says "it's a cover based shooter" and that puts me off- I hate the whole idea of basing games on this mechanic. I mean, seriously, cover based games now have less depth than Space Invaders- at least in that game the cover you could hide behind got destroyed. And the story's about as complex. I'm sure someone's said that, possibly yahtzee.
The other thing that annoys me in games are quick-time events- if Y says "this game has lots of quick-time events throughout" I probably won't buy it. Because I hate QTE as much as CBS...
Therefore, on these two points yeah I guess he does influence me, but in terms of opinions, no.
As I play SP-RPG and RTS games rather than other genres, his reviews really have little bearing on me anyway.
Tl

r
If yahtzee mentions "it's based on cover-based shooting and/or it has many quicktime events throughout", I will, in all likelihood, not buy it. If he genuinely really likes a game (portal), I'll certainly look into it. Other than that, he doesn't really influence me...
Edit
benzooka said:
Nope, sincerely. Most of his reviews are about, sigh, console games anyway. The rest are on games I'm either never going to purchase or am getting anyways. Naturally he does affect my view on some games, but that's just on titles I know nothing about beforehand, and after the 'review' I might now if it's a third-person shooter or a cooking simulation. And if there's a significant defect in a game I didn't know about, of the sort that I can't stand at all, in a game, then it sheds a bit of light on that.
No matter how satirical his show is, it still made me think less of him, when he dissed Tolkien in one of his videos...
Do you remember which video this was? Don't remember it...