Paul, my very favorite meal in the MDR is the Bami Goreng! It is watered down to suit American tastes so I have to ask for hot sauce for it, but it is really good. It should be since the chef who makes it cooks for the entire Indonesian crew!
I am a seafood eater and I have rarely had a poor selection in the MDR. HAL's cooking is IMAO right up to the best that is found at sea on any mainstream line.
The Pinnacle Grill is indeed very nice. It is well worth doing once per cruise. On another thread it was suggested that it is equal to the best dining in San Francisco. Sorry -- it is not that!