From what I gathered, he wasn't a big fan before G's solo success.
Not really a good comparison.
How many of the heavy, heavy jazz cats have ever had the "commercial" success (in modern times) of a Kenny G? I was more interested in Vail's take on someone with Metheny's credentials and esteem in the jazz world having such a negative detailed opinion on his boss' musical skills.
I don't really care about Kenny G either way. Vail is a monster (and actually plays with one of my former guitarists on solo progects).
But I do know that a young savant like keyboardist I used to play with, that had the scariest perfect pitch I'd ever seen (He got bugged because the air conditioning was humming at A=442 instead of 440. I checked it and he was right. I could randomly lay down all ten fingers on a piano and he could instantly tell me every note low to high.) hated Kenny G because he said he was out of tune all the time.