Costa Grande receives especially strong praise for seafood, with reviewers highlighting the fried mojarra, garlic shrimp, ceviche, and seafood soup. Several guests describe the seasoning as particularly good, and complimentary broth or seafood soup is mentioned as a memorable touch. Portions are generally considered appropriate for the prices.

The atmosphere is described as pleasant, quiet, and comfortable enough for conversation, making the restaurant suitable for anything from a solo meal to larger groups. The overall setting comes across as relaxed rather than formal, with the emphasis firmly on seafood and a comfortable dining experience.

Service is frequently praised, with staff described as friendly, patient, and welcoming. Several reviewers single out the personal attention they received, although a recent guest reported very slow service and unavailable ingredients during lunch. Overall, Costa Grande comes across as a seafood-focused restaurant where mojarra, shrimp, ceviche, warm hospitality, and well-seasoned dishes are the main attractions.