Hmm -- a stronger and much more negative reaction than I anticipated.

Although I know people have made fun of him over the years -- and partly his own fault (like overdubbing himself over Louis Armstrong's "What a Wonderful World" and then having to donate all the proceeds to charity as a possible 'back-pedal'), and also playing sharp a lot, (say the sax players I know) -- I was actually pretty impressed with the Sax-a-Loco tune -- it sounds like a classic. But not in the same genre as Morning Dance, Curves etcetera -- more like something that would belong on a CD beside older hits like Herbie Hancock's Cantaloupe Island.
He also set some records, such as the 45 minute note-holding technique he brought to our consciousness (I think someone else invented it, but he was the first to bring it to my awareness). The first time I heard him do it on his Live album it was a real sticker-outer that I played to a number of people. And they were all impressed with the emotion he generated by holding the note, and actually getting louder and stronger the longer he held it.
Not that I expect the world to agree -- but one of my die hard sax friends believes he deserves some respect -- he's one of the few instrumentalists to have broken into mainstream radio back in the 80's, like Santana did on the strength of his tone and musical ideas, although probably to a lesser extent. (And to his credit, Kenny did it without having to hook up with a vocalist like Santana did with Rob Thomas, Michelle Branch etcetera).
I'm not sure how these negative attitudes develop about artists who shoot to fame - for some, like Britney Spears it's the way they live their lives, but with Kenny G, Michael Bolton, and Celine Dion I don't understand it. I'm not a huge fan of Kenny G like I am other artists by the way -- but I do appreciate some of his work (like his Live album which I own on cassette tape). And I also appreciate his place in musical history with some of the achievements above.
(He just came out with his own line of saxophone accessories by the way, as a side-piece).