This was my first time on any cruise ship, and I loved it. I am generally very easy to please as I feel all vacations are what you make of the them.
Passengers: Lots of older folks and families. Though my friend and I are in our mid-20s, the dearth of folks our own age didn't really bother us. We did meet a handful of people our age and really enjoyed meeting plenty of people who were twice our age. The only place this mattered was in the club (one5) which was rather empty when we wanted to go dance. The silver lining was that we had plenty of room on the dance floor, the DJ played all of our requests, and the fabulous bartenders in there were all ours. We went every single night.
Crew: Amazing. Everyone was incredibly friendly and accommodating. We had the same waiters each night who treated us like royalty. Bartenders remembered our names after the second day. Cruise director's staff were all very fun and good at encouraging passengers to participate in activities.