I was on this same cruise and totally agree on the people. It was very odd and not at all what I expected on the longer Southern Caribbean cruise. It was very similar to the 4 and 5 day to Cozumel that I've been on several times. Just a lot of rude people and I'm not in the least uptight.
The kids club not being open the first night explains why there were screaming kids on either side of us the first night we went. We went 4 of the 8 nights on our last cruise and the first night was the only night kids were there.