We've done 10 previous cruises mostly with P&O or European cruise lines and this one was a disappointment. We won't go on a megaliner again. Too big, too crowded. The Explorer is just a money gouging exercise from beginning to end. Excursions ridiculously expensive (some were $400 US pp), as were bottled wine and water and cappuccinos. There was a huge concentration on spa treatments, facials, body pampering, drinks packages, specialist restaurants, shops selling high-priced junk, all at excessive costs and not much in the way of free daytime activities suited to older people.
The food was OK but nothing special and the wine service in the dining room was slow. The Windjammer buffet isn't big enough and we were constantly admonished over the loudspeaker to vacate our tables when we "had done with our meal". The walking track is half size and round the pool area so everyone gets in each others' way. It's essentially a party ship for youngsters who want to stay up all night drinking.
Our bill for gratuities plus four bottles of wine, a few coffees, one excursion and a purchase of $55 US in the shops came to $1,100 AU - too much for what we got.