MSC Seaside receives mixed reviews from guests. Many praise the ship's beautiful design, excellent entertainment, and some standout service staff. However, frequent complaints include small cabins and bathrooms, inconsistent food quality, crowded public areas, and issues with customer service. Excursions and port times also receive criticism, and some guests feel the value is diminished by extra charges for services. Overall, the ship offers a visually impressive experience with strong entertainment, but falls short in several key areas compared to other cruise lines.