We did the 2013 Med cruise which was 11 days: Barcelona->Villefranche->La Spezia (Florence/Pisa)->Civitavecchia (Rome)->Piraeus (Athens)->Kusadasi, Turkey->Mykonos->Malta->Barcelona. This was our second DCL Med cruise (first one was 10 day in 2010) and both were on the Magic which is our favourite ship. We loved it. All of the tours were fantastic. We did all DCL tours and for the most part booked those that were the longest so we'd have as much time in the ports as possible. The major drawback to a Med cruise is that the interesting things to see are typically 1-2 hours away by bus or train so they are long days with lots of travelling. If you are on your own, you have to make sure to give yourself a very good padding of time to get back to the ship as traffic, especially at the end of the day, can be insane, you can't anticipate accidents, late trains, etc. and even more time if you have to take a tender. A friend of mine nearly missed his ship in Livorno (not on Disney) because they mis-timed their train from Pisa, then got on the wrong bus and ended up having to get two taxis (he was with extended family) to get them to the port. They got there just in time - he still does excursions on his own but he is uber-conservative with his time calculations now and is constantly watching the clock.
Also, if you are going out on your own, make sure you purchase tickets to popular things online in advance. On our first Med cruise, we had booked a DCL tour to see David at the Accademia in Florence because I wanted to guarantee we'd see it (plus there were other parts of the tour I wanted). We were on the tender back to our ship in the evening and heard another passenger telling someone about how they had taken the very first tender that morning, took the train to Florence, went right to the Accademia to get tickets for David and were told that the first time she could get them was for 6 pm that night (last tender left at 7 pm). It never occurred to her that she could have arranged tickets online in advance. We purchased tickets for pretty much every major thing we wanted to see last year for our Italy trip. Granted it was 8 years later, but the ability to buy online wasn't new. Even last year, there were a lot of people in line to purchase tickets for every major museum we went to. I'm not sure they all got in.
Our first Med cruise had a day at sea at the beginning and end of the cruise and port days back to back in between. It was exhausting. The 2013 one had at sea days scattered throughout the time which was much better. There are fewer children on board which means there is more demand for the adult-only loungers and chairs in the adults-only pool area but we spent a lot of our free time in the Cove Cafe anyway so we were OK with that. We still managed some pool time. I'm not sure when your trip is, but our 2013 one was in early July and it was HOT! Temperatures in Turkey and Athens were 42C (108F) and other places were 35-40C (95-104F) often with little shade. Fortunately, the buses were air conditioned and the DCL tours we took they did provide water bottles. If you are on your own, make sure you take a refillable water bottle with you and fill up whenever possible.
I'm not sure what your expectations are, so I can't speak to whether they will be met or not but we thought both Med cruises were amazing. It was what led us to plan last year's Italy trip (which we ended up going with friends who we met as tablemates on our 2013 Med cruise). It gave us a chance to do reconnaissance on places we wanted to return to - several of which we included in last year's Italy trip - and places that I wanted to visit but had no interest in staying for a long period of time (e.g., Mykonos).