This was by far the worst cruise I ever took. I have been cruising for more than twenty years with Costa, Royal Caribbean, Norwegian, Princess, Carnival and unfortunately now with Mediterranean Shipping Crooks (MSC). These guys are pirates.
Let's start with the good side. The Opera ship is nice. That is it, nothing else to say.
Pricing: all the promotions they advertised on the newspapers were a lie. I paid my cruise six months in advance with a "30% discount" but other people paid less than me, a week before sailing and got a better room. This is not something common in Argentina.