From that generation - most likely. Let's see:
CG cheated on Silvia and he never seems friendly or approachable.
Henri "the Dame" was I think a good husband, his problem were most his ego and the fact that most likely he was not a good or caring dad.
Claus was very sick.
Prince Philip: There are rumours, but I think he was EII only and true love and I think they did have a very special bond.
Charles: Cheated and failed wife and sons - but was victim of the system at the same time.
Albert II: fathered Delphine to live and tell the tale.
Henri of Lux: Picked the wrong wife and refuses to see that. That family does not show any unity at all (scattered all over the place). His wife is in love with photo-ops, not with him.
Juan Carlos: Arranged marriage. Known to be a cheat.
So yes, Harald is one of the few really good husbands. But: He spoilt his kids too much, would not say that ML has turned out that fine. But it is a different topic.
I think the most important thing about PP was that he was the one person who could advise QEII and she would listen to him - even this glorious occasion (on wearing a less than flattering hat backwards to an event):
'The Queen couldnít believe that this would work. I told her that, if she did not believe me, she should consult the Duke of Edinburgh, as he always tells her the truth.At this point, I left the room feeling somewhat terrified, as you can imagine,' Angela went on, adding, 'Before long, Her Majesty called me back.
'She had consulted His Royal Highness and, after an amusing conversation, in which I imagine The Duke didnít hold back, the Queen had decided to wear the hat the wrong way around, as I had suggested.' Who knew Prince Philip was a handy man to have around in a fashion crisis?