As a "Pinnacle" prospect (by the end of the year), I cruise with RCI a few times a year and have stayed on them about the lack of consistency in the MDR. Using the narrative portion of your survey is a good tool and that way you can be honest if you have great service but "so-so" on the prepared food.
SO was very pleasantly surprised on the Mariner last month when both the quality and quantity of the prepared food showed a noticable improvement. Since I am also a travel agent, I found a little bird who told me they had indeed "cracked the whip" based on the customer satisfaction surveys. Keep up the good work documenting your experiences so hopefully "RCI" gets back closer to where they were in all of the dining rooms.