I have just returned from a two night cruise from Southampton to Guernsey on the MSC Opera and it was a total shambles from beginning to end.
Luckily some of our party had arrive earlier than us and secured our waiting number to check in but they and everybody else had to wait three hours. There were not enough staff to cope as the ship was I am told fully booked.
There were only two waiters in the bar we used on the first night so there were people queueing at the bar and at on time it was about ten people, but as priority was given to the waiters service was extremely slow.