In polite company (or even impolite company), you’re not allowed to say, “I think ‘Family Guy’ is a more inspired work of satire than ‘South Park.'” But I totally do! Its creator and costar, Seth MacFarlane, is a fast-break paragon of ripped-from-the-id naughtiness, but thus far on the big screen (the “Ted” films, “A Million Ways to Die in the West”), MacFarlane has proved a scattershot pottymouth prankster. What he needs is a movie that lets him up the ante of outrageousness on his most brilliant creation, and a live-action “Family Guy” could be more than a walking cartoon — it could be a surreal comedy of suburban idiocracy. I see John C. Reilly as the proudly clueless patriarch-boob Peter Griffin, Lena Dunham as the level-headed and neurotically charitable Lois, and — shrunken by digital technology — Jim Parsons as Stewie, the hilariously conniving baby misanthrope.