I was on the Arvia in the Caribbean in February 2023. Had not been to the Caribbean or on a cruise before so I can't compare it to others but I had a lovely time. I'm an active person (and had an inside cabin) so was out on P&O excursions almost every day - trekking a Piton, kayaking mangroves, snorkeling with turtles. They were really good, though some other guests said they'd been on a few terrible ones. All of the Caribbean islands were amazing and each one had its own uniqueness and history. We went Antigua > Kitts & Nevis ("Neevis" not "Nev-is") > Martinique > St Lucia > Barbados, though maybe not in that order. The ship was great and I really liked the American Diner, which I think is only on Arvia.
I did the same in November, it's a great ship. Did you do the Virgin Islands? What a place