Don Clark is right...I would give it a try. We did them all and much prefer NCL for its freestyle.
We've been on 15 cruises so far. Carnival (5), NCL (2-Bermuda), Celebrity (3) Princess (1) (Transatlantic/Mediterrenean) and RCI (4). We've learned that people's opinion of a cruise is strongly affected by their age, their likes, and their expectations. Cruises provide a variety of activities to suit different tastes. For us, visiting many islands is our main goal. We are a couple (childless) in our mid 30's / early 40’s with enough vacation to be able to enjoy many cruises. We're avid boaters & love the sea. We don't smoke, we love the outdoors & are beach people. We're not into luxury, we always book cheapest cabin because we want to be able to vacation a lot. We are not in the cabin except to sleep and dress - we don't have a butler at home - we choose strickly for our comfort. We get the same food, service, etc. and can take more cruises).
With all the discounting going on, it concerns us that cruisers may forget the most important aspect of selecting a ship: personal interests and lifestyle. If your only criterion is finding the lowest price available, you can easily wind up on a ship where you have nothing in common with the other passengers, which can adversely affect your enjoyment of the cruise.
For example, we recently sailed on Carnival Cruise Lines, Carnival Spirit. It is indeed a "Fun Ship." But what's your personal definition of fun? Triumph has Carnival's high-energy environment, lots of glitz, and a terrific array of nightlife. Although the slot machines are operational starting at 8 a.m., the library is open just an hour each day. At the other end of the spectrum is Holland America, whose passengers are largely retired. The service is genteel and reflects back to the early days of cruising. While there is some entertainment, after dinner the ships practically shut down. The point is, do your research first to determine which cruiseline/ships best suit your personal interests and lifestyle. Then start looking for the best price on those ships. We would rather spend a couple of hundred dollars more on a ship that gives us a fantastic vacation than become so obsessed with price that I land on a vessel that gives us only a so-so experience.