Well, there is so much variation between cruise lines, cruise ships, itineraries, business models of the lines and on and on, that one version of a so called misconception for a specific line or cruise may my not be at all a misconception from another's viewpoint.
Back to the basic: There is no such thing as a best cruise line, a best cruise, a best ship, a best itinerary, etc. what is best is what is best for you. There are over 75 cruise companies out there operating over 350 ocean-going vessels, then another 1000 river ships. Basically, a cruise is an escape from the stresses and strains of experiences on land. Unfortunately, some cruises simply aren't relaxing despite all the advertisements to the contrary. So you have to do due diligence and research, the more you cruise the better you become at it. Listening to fellow cruisers helps immensely.