Explorer of the Seas receives generally positive reviews for its friendly staff, enjoyable itineraries, and family-friendly atmosphere. Guests praise the service and cleanliness, but note that the ship is showing its age and could use refurbishment. Food and entertainment receive mixed feedback, with some guests loving the variety and others finding them mediocre or outdated. Crowding during peak times and issues with water quality and internet are mentioned as negatives. Excursions and ports are mostly enjoyed, though some were disappointed by last-minute changes or lack of coordination. Overall, the ship offers a good value and memorable experiences, but there are areas for improvement.