All the M class ships had a Murano type restaurant once upon a time. They were excellent. Sadly, they were all removed.
Re Le Petit Chef, since I had the PH, all the specialties were included, so we went to Le Petit Chef for lobster and steak night. I had avoided it previously, thinking it a gimmick. We found the animation to be amusing and the food was very good. Not sure I'd pay the high price that restaurant commands, though.