Cruises are never a good bargain, but this is ridiculous. They advertise cruises as if they are luxurious like they were in the early 20th century. They aren't luxury except for very few ships. After paying a premium price, you are stuck on a ship with people you may not like, eating mediocre grade food (all you can eat buffet food, at best), getting lower quality entertainment than on your home hifi, and you can't get away.
The passengers should get a double refund and use it for a self guided trip to Europe, Thailand, or Australia. The food and entertainment will be infinitely better, and you can go elsewhere instead of putting up with idiots for your entire trip.