We've been on 11 cruise lines and while I agree that there has been a decline in Holland America over the last many years, it's no more than any other cruise line, in fact, in some regard their decline is not as much as many cruise lines. We were on the Noordam last year for a 10-night So. Caribbean cruise and on the Eurodam for a 12-night Baltic cruise. Both were excellent. The food was very good as always, the staff was wonderful, and we thoroughly enjoyed them both for different reasons.
I do agree with the Rotterdam being our favorite HAL ship - it's wonderfully classic ship more in the old-style than the modern ships.
But I would still give HAL higher ratings than most cruise lines because they still offer an excellent cruising experience without the high cost of a luxury cruise.