Yes, complain: if you do that is the best thing, the individual who lets the side down complain, and give their line managers the opportunity to give them feedback, to improve their service levels for the greater good, or consider a different line of work outside serving people.
Overall it doesnt work in reverse, what we need to understand is our dinner servers also serve at breakfast and lunch at various places. We are not asked or suggested to tip at these times.
It isn't correct to penalise the hard working people at dinner if one individual at a service outlet doesnt meet the very high standards of
DCL, and their training.
We have a few things coming into play with these discussions. Here I am talking generally and not back to your quoted post in particular.
We all pay a lot of money for a good vacation, a cruise is considered a luxury, you should get good service, for your well hard earned cash.
The servers overall work very very hard, this is due to the majority of their income coming from tips.
Some cruisers, do not agree/ or want to pay tips, so they will look for any excuse to reduce their tip, to save money.
Tips are suggested and personal, we have a guide, we understand that from when we book, and thought the ticketing and information process.
Tips should not be expected, but nor should tips be deliberately avoided or severs stiffed.
So in summary if you get 'underperformance' you complain, they will put it right and you should get a good holiday. If you do not say anything, then the person on the next cruise also gets bad service. DCL doesnt know you were unhappy, and the servers can be confused why tip is low, speak up and enjoy.
I have only tipped below level once, that was my head server, mentioned before, his tip was added to my servers and I added more.
I have regularly tipped over the recommended amount but thats personal preference for excellent service and attention.