Our second cruise, second with Carnival, previously sailed on the Legend. The Glory is comparable-better in some categories, worse in others.
Rooms: we had a category 4J room, interior with a picture window, 7206. Great location, and despite what you may have read, there is a view other than a railing, unless you're laying in bed. Every day we could look out on the port we were approaching. Bed comfy as always. We had a handicap accessible room, which provides a HuGe bathroom (just as big as the bath in our Vista Suite on the Legend, but without a tub and only one sink)
Service: Cabin service OK. Our steward would often enter our room without knocking, but only shortly after we entered our cabin. Still, was a bit disconcerting. He did however remember our names and greeted us by name all the time. Best bar service was at the Kaleidoscope bar in the casino.
Great cabin if you can get it. Window for an interior price. All the way forward, next to a door to one of the "secret decks". The door to this deck can slam--loud enough to wake you up. Be aware that people can (and do) look in your window. Overall a great deal though-large room, huge bathroom, all for the price of an interior room.