I cannot imagine they would be disappointed on a
Disney cruise. I just can't see it happening.
My kids DO like rides, they DO love Disney World (and now
Disneyland) -but how they react after a WDW trip vs a cruise is a huge difference. When we are leaving WDW there is mild sadness that it's over... when we leave a Disney cruise it's a HUGE sadness and it goes on and on and on.... LOL That's the only down part about Disney cruises- they don't want it to end! Even when we went on the 15nt- still unhappy about leaving, sadness when considering how long it would be before we cruise again, etc. And when we left the last cruise they knew it would be about 2 years before we'd cruise again- our cruise plans changed and now we're going again end of May (a mere 8mo instead of 2yrs in between cruises- AND we only decided on this recently so really only 5mo to wait once we knew) and STILL they wish it would hurry up already because they say it's too long to wait.
LOL
I think any kids- of any age- will like it for different reasons, but I honestly can't imagine any child being "unhappy" that they were on a Disney cruise. Unless they got really sick or something else (beyond Disney's control and beyond anyone's control) -just can't see it happening. There is going to be SOMETHING they love about it, I'd say 99.999999999% positive about that.