I really didn't know much about cruise lines and am hearing more and more about this one--as ship docked next to us looked absolutely amazing! I hope to learn more about it and we are considering it for a future adults only sailing.
If you want to learn a little now, my opinion from a mostly Disney cruiser, with experience on Princess, NCL, Carnival (once) and -
I have done two cruises on MSC Seashore from Miami (Eastern Caribbean).
My take: large ship. New ship. Easy enough to navigate. Decor is somewhat 1980s Las Vegas. Not cheap looking. A bit over the top compared to Disney. On this ship class, they have an outside “boardwalk,” for lack of better word. Uncovered, with some tables and chairs and a very nice rectangular infinity hot tub that holds many people (never saw it overly crowded or too hot). It actually is a great place to enjoy deeper water.
Overall, it is a very lively ship. A multi-story atrium has live music much of the day. The pool deck has Trivia and games. There is also an indoor pool. There is an adult pool area with infinity pools.
The cabins are roomy. Bathrooms have shower doors, not curtains, which is a + to me. And no tub wall to step over.
The first cruise was Fall 2021. (Capacity capped at 30-50%.). We were the first sailing from Miami. In a temporary terminal. It was a mess - long waits. Even long processing time, unlike Disney’s show your passport and boarding pass and move on. Next time, still a mess. They had improved the actual processing procedure, but poor communication and crowd handling. We used my priority boarding (from loyalty status - see below).
They have a reputation for poor Customer Service and poor IT (it is possibly worse than DCL). I might have to agree with the reputation.
MDR servers were similar to any cruise I have been on. I would describe the food as not as good as DCL.
The buffet on the full cruise was too busy. So many guests. Lots of square footage, but difficult to find a table near food. Norwegian CL’s large ships didn’t seem to have this problem.
They don’t know how to do trivia. Everyone else seems to know how. I had a hard time finding activities. Their production shows tend to have no talking. Singing would be modern songs in English. This is to accommodate guests of many languages. I saw some well done acrobatics. Drinking and music seem to be primary activities. But not Carnival style.
They have an excellent steak house.
If you have higher loyalty on a cruise line, they will Status Match to their program. My DCL Platinum (before Pearl existed) matched to MSC’s top tier. So a free specialty dinner for cabin.
First cruise was heavily Columbians and another Caribbean basin country. Very much extended families traveling together. They know how to dress for dinner! The next cruise was more Americans, so more cruise casual.
We stopped at their private island. Lots of separate beach areas. A reclaimed industrial site, it is in the process of growing foliage. It is an attractive destination, with jet skis and small craft adventures at reasonable prices. But umbrellas are extra charge and there is essentially no palm trees to use for shade. We had overnight stays, allowing guests to enjoy sunsets on the beach.
The price is such a drawing card. My sister and I had connecting balcony cabins for ~ $1K each (solo) for 7 nights. Fare & taxes. I got a non-alcoholic drinks package. As we were in separate rooms, it wasn’t required that we both purchase.