MSC Seaside receives mixed reviews, with guests praising the ship's beautiful design, excellent entertainment, and some standout service staff. However, there are consistent complaints about small cabins and bathrooms, repetitive and bland food, inconsistent service, and issues with crowding and organization. Excursions and port times are also a point of contention, with some negative experiences reported. Overall, the cruise offers good value for the price, but falls short in several key areas compared to other cruise lines.