We go on a Marella cruise most years, so we like it. They are medium-sized ships.
I don't recognise a lot of the descriptions given here, but most are from non-cruisers who have absolutely no idea.
We don't really go up onto the pool deck with the lobsters, but find plenty of other parts of the ship that suit us. I like the adults-only deck with the shady cocoons to read my book and drink my cocktail. DH likes the coffee port.
We did a lot of the entertainment when the teenage DDs were with us but now we pick and choose what we want to do.
We always eat in the main dining room rather than the buffet. If we are lucky, we will strike up a conversation with those sitting next to us.
As for going ashore, we have always dumped plenty of money into the local economy - whether buying a nice lunch, hiring sunbeds, stocking up on limoncello , entry fees. Excursions are provided by locals, both coach drivers and guides.
A Marella ship will typically be in port for over hours, so there is no need for everyone to get off at once. Excursions have staggered leave times.
We have not experienced 'Butlins on Sea', but this is more driven by your fellow passengers rather than the cruise line. We've done our fair share of holiday parks when our children were young, and there is no way you could compare a cruise to Rory the Tiger.