I've known a few entertainers who've worked on cruises. I've never seen the acts that perform, but I'd expect they're quite good.
I've also heard that some passengers try to party in the staff bars, especially if they're younger people on a seniors' cruise, because they prefer partying with the younger staff and entertainers.
Have you enjoyed the entertainment on a cruise ship?
A friend of mine just got back from a cruise this week. He saw a show with one of the singers from the old rock'n'roll group Shanana, and he could have seen Danny And The Juniors, too.
He also saw a single act singer in another bar. Basically he enjoyed all the entertainment he saw on the ship.