Read cruise to nowhere cruise reviews before you make a reservation. It's eye-opening to learn from the experiences of previous passengers.
There are more than 500 reviews of cruises to nowhere on Cruise Critic. You can sort them by cruise line so it's easy to find what you want. The majority of ratings are excellent.
CruiseLine is another site with hundreds of cruise to nowhere reviews. The comments are short but are enough to give an impression of their experience.
The consensus of the reviewers is that these quick cruises are fun. The ships are so big that there is hardly time to see and to all that is on offer.