Our family went on the Carnival Liberty for spring break, departing on 3/31. We had 2 families in total with 6 kids total - ages 2, 12, 12, 13, 14, 14.
We have been on many cruises - RCCL, Princess, Carnival, NCL, Disney, although we had not been on Carnival since approx. 1997. We chose this cruise because of the cost, and the itinerary. We were a little unsure what to expect after reading some of the reviews.
It was a fun cruise. It's a bit more casual and lively than the other brands I mentioned, but it was fine. The kids had a great time. In particular, the teens & tweens had a lot of fun, although not in a particularly structured way. They did not use the structured activities much. They mainly used the pool, sports court, EA sports bar, etc.