We’re not surprised that Babbo is the city’s top Italian restaurant, according to Zagat’s new America’s 1,000 Top Italian Restaurants book — its popularity alone is enough, in Zagat-land, to ensure yearly dominance. And in fact, Babbo is a wonderful restaurant, four stars by our lights, and justly beloved. But if you had any doubt how unreliable the Zagat surveyors are, just check out number two: Village relic Il Mulino! Now, don’t get us wrong: Il Mulino is a fine restaurant and uses very expensive ingredients to good effect. The tuxedoed wait staff are as servile as ever. But it should be the second-most-popular Italian restaurant of 1958. Haven’t the matrons of Secaucus ever heard of A Voce? Or L’Impero? Or for that matter Del Posto? Don’t look for any of those at number three: The winner there is another beloved mummy, Roberto in the Bronx.