After reading the reviews on the Costa Deliziosa, we were worried that we wouldn't like it, but having already tried Royal Caribbean, Princess and Island Cruises I can honestly say Costa were far better than our previous cruises.
The ship is immaculate, the staff were brilliant, very attentive and really nice, the food was excellent, good quality, served very efficiently and well presented and the entertainment was far better than RC or Princess. We embarked at Dover, with the cruise having started in Copenhagen, we were two of only 20ish english speakers on the passenger list out of 2600, the passengers were mainly italian and german, but we never had a single problem with language as a very large proportion of the staff were very good english speakers.
We visited Le Havre (check out the awesome church), Vigo, Lisbon (stunning) Cadiz (where we went to Seville - again stunning) and Malaga, we ended up in Savonna where we flew back to Gatwick.
Embarkation and disembarkation were very well organised. The highlights of the cruise were the animators who entertain the passengers around the ship with the hysterical Fabito who does candid camera stunts which are shown before the evening shows. The evening shows are glitzy, professional and nice with a crew x-factor type show which was lovely. The english hostess Rebecka was really attentive but not "in your face" and always available if we had a problem, which we didn't. I would really recommend Costa it is far better than the previous reviewers have reported. We will definitely use them again.