I don't mind them asking like some people do. However, on the last several cruises we break the ice ourselves by telling our waiters:
"After we get off the ship tomorrow you will receive a survey about how we were as guests this week, We need you to puts 10s across the board. Not 9s or below but 10s"
We all have a good laugh and they don't bother with their survey pitch. 🙂
We also don't let things fester so if there is an issue with the waiters we have already addressed it during the week.