We have cruised many times before and are also used to the North Sea because we live close by.
As we left Harwich the Captain advised that the crossing to Norway was going to be rough - it turned out to be one of the worst journeys we have had although we have travelled in much bigger seas. We understand this was exacerbated by the lack of stabilisers on this older ship.
The ship is old and in need of attention. The toilets in the Lido are ( for example) in very poor condition. Our balcony cabin on deck 10 was spacious and appeared clean. The bathroom includes a bath. We returned to the cabin one day to find the bath contained a few inches of dirty water containing lots of gunge due to the drains backing up. Eventually plumbers sorted this but we had to ask for the bath to be cleaned. Later that evening water flushing the toilet and coming from tap was discoloured.
Food was mediocre although waiting staff were very good.
Entertainment was ok but on sea days we didn't think there was enough to do. The shops own singers and dancers were very good but guest entertainers were dire.
Ports were excellent although HAL does not provide any port information for guests.
Usually when we have travelled on American ships in Europe it is possible for parents to give permission for under 21's to drink alcohol. This was apparently not available for my son who is 2 months away from his 21st birthday and lives independently. Crazy!