Unfortunately, MK is really lacking in good TS restarurants (IMHO). The nicest atmosphere would be CRT, I guess, but it is pricey and inconsistent. We don't care for Tony's for dinner, but it is fine for lunch. Ditto for the Plaza. The other 2 TS restaurants are buffet or family style.
What about one of the monorail resorts? Kona at the Poly has a nice dinner. The Wave at the CR is getting good reviews. Plus there are several nice signature restaurants (CA Grille, Narcoosees, Citricos, Artist Point (at WL))