Chef Ken Duckworth's "stellar idea" to present half-portions and half glasses of wine – letting grazers "try several" of the "imaginative, beautifully prepared" dishes from his local-leaning New American menu – "gets rave reviews" from frequenters of this Gloucester "treat"; "welcoming", "attentive service" rounds out a "fine"-dining experience "without pretension", but it's "tiny", so "reserve...