Preliminarily, this was my second cruise (the first being a Caribbean one on Royal Caribbean). However, I have travelled extensively throughout Europe on business and I am a seasoned traveller. The decision to book on Carnival was not my own, but I was part of a group of about 12 persons which included my partner. I exclude from this review any commentary about ports or Carnival organized excursions (we organized all of of our own, at significantly reduced prices). I'll also say that I am in my mid-to-late 20's: I'm not being an old crabby person when I complain about a lack of formality, quiet spaces, children, etc. I've got my fair share of patience and I am not wealthy.
This was the Breeze's second sailing, Barcelona->Barcelona with ports in Marseilles, Pisa, Rome, Venice, Dubrovinik, Palma de Mallorca, et al. It was a 12 night cruise with 8 ports (I believe). We set sail on 6/12; you can look it up.
On the whole, I would characterize the experience as "mediocre." Many parts of the ship left me feeling underwhelmed, but the nice ports and time spent off ship contributed to a generally positive feeling. Were there more sea days or was I on a less engaging itinerary, I believe this review would be far more negative. I apologize for my rather disjoint comments, but a bulleted list is the most convenient way for me to discuss the experience: