Went on an MSC cruise in July thoroughly enjoyed it. However it was a cruise from Southampton so I would say 50% were Brits however there were a lot Italians, Germans, French, Dutch, Spanish Portuguese. and a few Americans and East Europeans, no problem except a bit of a sunbed dispute with a Russian woman.
It can be a bit tedious when all the announcements are in several languages. Would cruise with them again but prefer Thomsons.