Besides R-C's and Four Seasons, Relais & Chateaux at the high end. Starwood's Luxury Collection often have very good restaurants (particularly Lespinasse at the St. Regis NY), also at the high end. One of my favorite retaurants (at the same end) is the Windsor Court Grill in New Orleans. Several steps down, Le Meridien restaurants are usually pretty good and Intercontinentals are generally decent.