On Navigator, the crew had an American Idol show which drew the biggest audience I have ever seen on a cruise. It was great fun and made a wonderful way to get to know your waiter, etc. I imagine it was like the Dancing with the Stars on the Mariner recently.
I agree with most all the above but would like to throw in our two cents for the free cruise after reaching Platinum level. Love the free laundry but I'd rather have the free cruise!