They're just different....I like them BUT they're different and you need to understand that.
Last time round we had been allocated early dinner. We asked to change dining times and on most cruises they would say either no bother or let me see what I can do. On MSC they said "you want to change? You're only Bella experience, you can't change". Didn't check if there were tables free or anything like that, just a complete no.
As I say...I like them. But don't expect the same CS as other US based ships.