We are experienced river cruisers and usually love the on board experience, our cruise on the Sky was the opposite. We transferred from the Star due to low water levels and the experience could not have been more different.
The ship wasn't full but the noise levels in the restaurant were intolerable. Groups of younger Americans competed to see who could make the most noise, including whooping when they were served a drink. Emerald's restaurants are all hard surfaces which amplifies the problem.
The cruise director did ask them to keep it down but this only lasted one evening. Many guests complained to no avail.