I love Chris, (and I know people who know him and say he's a big sweetheart) but I think he's getting a little cranky in his old age. He's doing a lot of shows currently on this political Dark Age we're in, and he really has difficulty bringing the funny to those--seems to get stalled at just a kind of exasperated sarcasm. Way back before the Best Show, though, he was about the funniest thing on WFMU (well, him and the Vanilla Bean). In the archive, he recently put up an old show that really shows him at his storytelling best: "How Debbie Got Her Spots."
As for the impostor: Did he come off well, or was this someone trying to darken the Greggulator's name?