We were on the Caribbean Princess with a small group of 9 family and friends. We got an aft balcony and it was great! We had enough room to go get another table from the Lido Deck along with a bunch more chairs. Needless to say, this is where the party was! (We were having a bon voyage party for our daughter - she left for Navy boot camp 3 days after we got back from the cruise.)
It was large, covered, and perfect for us. Would book that again in a heartbeat!
But those ships are more straight up and down in the back, so all the aft cabins are covered. Those that are slanted alot, such as on the Breeze, have open balconies, of which I'm not a fan. We like our shade so we can enjoy the balcony more often during sea days.