We were on the Regatta cruise just before yours, and I feel your pain about the bathroom, especially the shower! LOL. But we really got quite used to it and ultimately it was not a problem.
We too thought the entire experience was wonderful, and that the food was really good. The only exception was the room-service coffee in the morning. Waaaay too strong. And we love strong coffee, so you know this was really over-the-top strong. My husband started getting us coffee at Baristas instead.