I believe that the room service menu(s) between ships is fairly standard.
I'd venture to guess that the comments you are hearing are from people who went on her and are trying to compare her to the newer/glitzier ships. She is a bit older and much more sedate in decor, but that being said, is one of my favorite ships (71 cruises, 36 on Princess). Love her wide halls and layout.
Food opinions are very subjective, I take food comments with a grain of salt, as one person thinks Ruby Tuesday is gourmet and others don't, food on ships is the same for opinion.
Go and have a great time!