I've provided the same review on OpenTable, and will also post on TripAdvisor. My wife and I celebrated our 25th anniversary @ J&G, and our dinner was spectacular. In a city with a reputation as a world-class resort/vacation destination, and with an abundance of superb restaurants, I'd rank our dinner as absolutely first-class.
My wife is a native New Englander, and I'm an honorary NE citizen. Our raw bar appetizers and dinner were literally perfect, and on-par with any high-end seafood restaurant I've experienced anywhere.
J&G made certain that our anniversary dinner was perfect, and we'll return soon!