I am a seasoned cruiser and have cruised most of the mass market lines. I was attracted to MSC because of the value rates offered for single travelers. Yes, I did this one solo! Being alone I would be able to see all the negativity that you all are talking about, without worrying about someone else. Two weeks before the cruise I found a singles group of 33 members sailing together and I latched on with them. I would have company when I wanted especially for dinner as we had 3 tables reserved. I took two first time cruisers under my wing and had a BLAST! Your on vacation and you want to relax and avoid negativity and this was my approach. My two companions got a good adult traditional introduction to cruising.
Now, if your into rock climbing, ziplining, watersliding, surfing or whatever other BS that most people don't do on a ship; avoid the Poesia. I had Baseball Greats on my cruise for the week. True athletes that revealed their experiences and directed activities. MSC does this frequently to attract Americans and to me was worth the price of passage alone.
This is a large elegant ship where tastefully designed lounges flow seamlessly. Yes, live music every night in nearly all of them. Deck 14 aft has a ultra modern disco that goes til the wee hours. Deck 13 features a spralling double pool/multiple hot tubs area with sunning and shaded areas. Like all ships it's crowded during the day. Deck loungers have a unique shade feature attached.
Inside cabin was smallish compared to some other lines, but well appointed. Could be a problem for two larger people.