Personally, I don't hate the show; I'm indifferent to it. Raffy loves it, though, and that's nigh-inexplicable to me. Our Favorite Rat frequently castigates mass media for being unoriginal, derivative, crammed full of in-jokes that are only funny if you recognize the references, and not nearly as shocking or daring as they pretend to be (a.k.a. "Behind the Railing").
Family Guy scores four out of four on that scale. As I said, I'm indifferent to the show, so I never bothered to enumerate all that before. Weinman deconstructs the show's flaws admirably.