I've just been looking at the site mentioned above and found the following under 'cruise etiquette' - it certainly raised a wry smile:
"On any given cruise you will run into individuals who are chronic complainers and will share any and all their grievances, to who ever will listen to them. Politely point them in the correct direction of a senior crewmember."
Incidentally it is a very useful site. I'll try and see if they have anything specific on the rest of our ships tomorrow, but I can hear my bed calling now.

- Couldn't resist checking it out now - I found the Melody, just put the name of the ship into the above link (I know everyone but me would have sussed that out long ago) - the itinerary is different from ours but there is lots of useful interesting info.