I have yet to go to the casino, but I remember when they built it that they added quite a few restaurants that were supposedly good, is that not the case? Looking at the website there is quite a lot to choose from, including:
Rare: Steakhouse
On deck: burgers, wings, beer, sports bar
Red 8: Chinese, dim sun, wok noodles, duck, seafood
Garden Cafe: American breakfast, brunch
Cheese Meet Wine: carved meats, cheeses, wine
Night Shift Brewing Kitchen and Tap: pub fare, locally crafted beers
Mystique: Asian inspired dishes, sushi
Fratelli: Southern Italian specialties honoring the North end
Frank and Nicks: North end meatball subs, eggplant, chicken parm, paninis, pizza
Shake Shack:
Dunkin:
https://www.encorebostonharbor.com/dining-and-nightlife