I think that P&O left the interior decor of Ventura and Azura much more like the Princess ships, which IMO are more glitzy than the 3 newer ships which, again IMO, have ended up looking much more like a John Lewis department store than a typical American style cruise ship.
As a result they do appeal to us far more, however without a major refit of the cabins, including far bigger flat screen TVs, then I don't think we will be considering any future bookings on them.