What makes you say that? I find them to be pretty amusing.
I find them mildly amusing, but I find that they're one of those acts that gets way too hyped out the ass by people who want to wow people with their dadaist interests (like college assholes who buy Che shirts). Zorn's a kind of darling in the world of those collegiate avant-garde hipsters and punkrock "intellectuals", and that's
never a good thing. I personally think that Zorn is not a very inventive sax player and that most of his groups rely way too heavily on their "out there" aesthetics. As a composer, he overuses pastiche methods to the point where everything sounds like a hodge-podge. Naked City has one composition where there's a minute-and-a-half of completely random-seeming stylistic shifts, all carefully-composed, but what does it really matter? Each little segment has some very specific source from elsewhere in the twentieth century and the only difference is that it was original THEN. Another good example of this style is definitely seen in his piano composition
Carny, which jumps from one style to another and never quite sounds like it could be, well, a style for John Zorn the individual. Naked City operates the same way, drawing in a little bit of hardcore, playing some snarky TV theme covers, and of course the obligatory atrocious full-frontal-assaults of screeching and squalling improv that Zorn and his groups always seem to come around to (.....yaaawwnnnn....).
Don't get me wrong, the musicians in that group are awesome, but I think everyone of them has done better work in pretty much everything else they've ever worked on, especially Fred Frith and Joey Baron. I don't think the "singer" is worth the cost of all the microphones he's probably ruined. Zorn's leadership turns them nothing more than a flash-in-the-pan musical oddity for hipsters and record collectors to pin on their chests as a symbol to impress upon, well, other hipsters and record collectors.
Zorn's qualities as a composer have slowly been coming into more focus these past few years as he has spent more time dabbling in classical-ish composition (chamber pieces, etc..). I really liked his discs
Magick and
Mysterium, which featured a variety of different instrumental pieces and a very excellent vocal work (I don't remember the names off the top of my head).
As a heavily-involved enthusiast of the scene that John Zorn's work stems from, I assure you that there's consistently been dozens and dozens of other musical things going on that are worth more of your attention and that are far more rewarding.
(sorry for the rant, but since Zorn recently got one of those $500K genius grants, he's certainly up for discussion).