Ryan, we went twice during the week: the first formal night - uncrowded and service was prompt and excellent; and then we went the last night of the cruise - over-booked, crowded and service was extremely slow. I think the message got around through the week of what a wonderful, worth-the-money experience it was, and, consequently, everyone wanted to go at the end. So my suggestion is book early and go early in the week.
And I echo Maria's recommendation for the goat cheese souffle.
Enjoy!
PBP