Our main bugbear with P&O is the endless repetitive itineraries - particularly those in the Caribbean. We have rather overdone the Caribbean cruises over the years and have enjoyed most of them on the lovely Azura although also once on Britannia and a 28 day bean feast on the lovely little Adonia. We've visited the ABC Islands, Grand Cayman, Trinidad & Tobago, Isla Margarita, the Amazon, Ocho Rios and the St Maarten, St Lucia, St Kitts bunch (repeatedly). Often we booked a B2B - 15 day islands then a few islands and back to Southampton. Now of course there is no variety between concurrent weeks so not much joy in a B2B.
To add to all this anyone flying from Gatwick(?) or Manchester will fly in an old plane with no in seat entertainment. We've enjoyed the alcohol laden TUI flights in their lovely Dreamliners immensely. Perhaps P&O now realise why most cruiseliners don't include flights. I think that's possibly on the cards.¹