I too have sailed on the Ryndam - Sep 2010 - in Alaska.
Like Alan, I was disappointed - I ate only once in the MDR and the Lido Buffet was awful - JMHO.
I did post on this board my thoughts - and was advised that I was unlucky and give HAL another chance.
In short I won't sail Ryndam or HAL again.
Book another vessel is my advice.