I'd say to just drop it. As you already said, you have a far greater experience with Disney that shows this is a one off. At least your cruise had power, working toilets, and cuisine beyond onion sandwiches!
I see your point, and I'm a glass-half-full kind of gal myself. But I can't agree that this is going to become my standard for vacationing, I believe Disney has set the bar a bit higher and we can reasonably hold them to a higher standard than onion sandwiches.
