I would enjoy any jazz cruise, but Malt Shop Memories would not really be my cup of tea (or tumbler of ice cream, as the case may be).
The only "malt" in my musical memories was in the bottles of beer I was drinking.
But yes, I agree that it is fun to see what people who go on a music cruise as first cruise end up thinking about the ship. A lot of them say - "we never even thought about taking a cruise, but this line up of bands sounded incredible, so we thought, "why not?"
Most of the time, they end up liking the ship. But music cruises are much different from leisure cruises - a lot more active. Especially for me, I feel like I want to be every place at one time.