The MSC Preziosa is one of the 4 large ships in the MSC Fleet. As this site says, I found out that originally as a ship ordered by the Gadaffi Regime in Libya by his son which was to include a huge shark aquarium etc!! After the downfall of Gadaffi, MSC bought it and created the MSC Preziosa.
I was on the Maiden Voyage in the Med. First time I had been on MSC Cruises and was worried that the many languages may be off putting. In the end I had a great time, and liked the ship a lot.
It is a bigger ship than I usually cruise with (being more Cunard and P&O Arcadia fan) and had over 3,500 passengers and 1,300 crew. The ship is very modern but not over the top and too "Las vegas" Like. It did not look like an apartment block on top of a hull.
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Watch out as noise from the spin class below in the gym comes through loudly at 8am and 5pm. So avoid - or check if they moved the classes to different part of the gym!