Cruise liners are only for those who have no imagination or mind of their own.
It's like going to Maplands in Hi de High
http://en.wikipedia.org/wiki/Hi-de-Hi!
I had a horrible experience last year on a cruise and would never repeat it even if it was a boat load of gay men... in fact that would probably be worse than what I encountered.
Certainly go on a cruise if you have no imagination and want everything handed to you.
The entertainment is worse than most armature variety shows.
By the end of my cruise i wanted to throw myself over the side of the boat.