Quite honestly, we tried RCL about a year and a half ago and the 3 of us all agreed that it was our least favorite of the 15 or so cruises that we've done. We sailed on the Serenade of the Seas and there just wasn't much to do on the ship. I found a couple of things odd on RCL. First, there was no poolside grill on the ship. To this day, it's the only ship we've sailed that hasn't had one. It was an issue as the Windjammer was closed from 2 to 6 each day, so it was only a little stand called Park Cafe (which was in the adult section) that had a very limited selection of snacks during the day. Second, RCL took the luggage up to the rooms via the central elevators, causing big traffic flow issues on embarkation day. There were a number of other things we didn't like as well, but perhaps it was just the ship. That being said, we really haven't found any really great deals on RCL, especially compared to Carnival or say Princess.
Last year, we branched out and tried Carnival, all thinking that we would hate it. We loved it! Took the Sunshine out of Port Canaveral and had a great time. The Guy's burgers and Blue Iguana locations were really good. Also, there were lots of fun things going on all the time. We will be taking another Carnival cruise this year. We haven't tried NCL, but we have done a number of Princess cruises and have really enjoyed those as well (good food and really relaxed atmosphere).
I will say we definitely prefer
DCL, but yes, they are getting a bit too high. However, like a few others have pointed out, if they reach a price point that the market won't bear, then they will have to make a correction. I actually don't begrudge DCL from trying to make money. They are a business, not a charity. They will have to decide what the best plan of action for the brand is. My only comment would be that I hope that they are taking the long run into consuderation as well as the short run.