I would describe
DCL's food as "tiresome". It isn't for the most part inedible; i.e., if I went to a restaurant and got their food I usually wouldn't send it back. I just wouldn't go there again. I agree with a lot of the commentary already posted (powdered eggs, bad steak, grocery store quality pastries, etc.).
These would be my major complaints:
1) Flavor profiles of dishes in the MDR are extremely bland. The food sounds (and to their credit, looks) a lot 'fancier' than it actually is. From the perspective a self-described food snob, there just isn't anything interesting about it.
2) The product, particularly proteins, tend to be sub-par. As stated, beef is certainly not of prime or even choice quality. A lot of the seafood--particularly shellfish--has an off flavor. Obviously you're going to be eating meat/seafood that has been frozen.
3) Given the assembly line nature of the MDRs, not surprisingly there are missteps related to food preparation/temperature. Meats tend to come out on the overcooked side; if you decide to order steak (which I wouldn't advise) and want it anything south of medium well, order it rare. Temperature is usually not ideal either.
I don't agree that the waitstaff can make it right, and I also haven't been impressed with the results of following their recommendations. In general, the food is just not good and I don't think there's anything to fix that can be fixed short of a cruise line wide overhaul of food service.
I agree that the buffets are easier to cope with...there's a lot of junk but usually there are one or two things that are pleasant enough to eat, and you don't have to sit through a 90 minute production to eat. Unfortunately, there's no buffet service at dinner.
I thought Remy was worth about what I paid for it. It was far better than the MDR food, but I wouldn't put it at (or near) the category of "best dining experience of my life".