We love Artist Point, Jiko, Citricos and Flying Fish, most of all (though if we have a chance, I'm sure we'll love Blue Zoo as well). Narcoossee is good as well, as is Yachstman Steakhouse, Shulas, Palio, Brown Derby and California Grill.
However, these restaurants all have something else in common: They're expensive!

They're either not on the dining plan, or require two TS credits.
So, among the one TS credit restaurants, the best, IMHO, are Coral Reef and Chefs de France. (Coral Reef was so close that it actually used to be two TS credits, and they switched it. I cannot understand why Chefs de France isn't two TS credits, it's that great.) Spoodles and Boma are quite good too.
We're taking another couple with us next year, no children, and here are the recommendations I'm making. (We're staying at the BoardWalk, and we won't have a rental car, so I only recommended restaurants that were in theme parks, or within walking distance of the hotel.
Epcot:
1 Coral Reef (Seafood; 25 foot high window into aquarium)
2 Chefs de France (French; best food inside the theme parks)
3 Biergarten (German; buffet)
4 Mitsukoshi Teppanyaki (Japanese hibachi)
5 Restaurant Marrakesh (Moroccan; belly dancer show during dinner)
6 Rose and Crown (English; 30% chance of getting a fine view of Illuminations)
7 Le Cellier (Steak)
8 L'Originale Alfredo di Roma (Italian; a number of bad reviews)
Epcot Area resorts:
1 Spoodles (Mediterranean; not as good as it used to be, but still good)
2 Big River Grill and Brewing Works (Burgers; not worth a special trip)
3 Yacht Club Galley (American)
4 Beaches and Cream Soda Shop (Burgers; not worth a special trip)
5 Cape May Cafe (Buffet; slightly seafood biased; not worth a special trip)
6 ESPN Club (Bennigans-type food; not worth a special trip)
Disney-MGM Studios:
1 50s Prime Time Cafe (Homestyle; EXCELLENT themed experience)
2 Hollywood & Vine (Buffet)
3 Mama Melrose (probably down for rehab)
4 Sci-Fi Dine-In Theater Restaurant (Mediocre themed experience)