He's an entertainer, not a reviewer. You wouldn't go to - or avoid - a particular holiday destination just because some comedian keeps making jokes about it, would you? Actual reviews here at the Escapist, maybe. Reviews elsewhere, possibly. But mostly I buy games because I think/know I'll like them.
There are two notable exceptions, though; the way he described Saints' Row 2 sounded good, so I bought the game, but I didn't like it. And I bought Psychonauts based on his recommendation, which I do not regret.