Not sure what the issues people have with Carnival

. We had a great experience, top notch service, fantastic food, great ports of call, great excursions - both times we cruised with them - so for us good value for the $$ spent.
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If you cruised with Carnival and enjoyed the experience then that's great. If you have not sailed on other cruise lines, as some of us have, you really don't have anything to compare it to. I would equate a Carnival cruise to staying at a Holiday Inn and visiting Six Flags. OTOH, I would equate a Disney or RCL cruise with staying at a Disney deluxe and visiting WDW.
The issue, really, is that you can't compare Carnival and WDW and say you're comparing apples to apples. You're comparing a Honda Civic to a BMW.
If the bottom line is only $$ spent, that's fine. But for some people value equals more than just $$. Quality has to be factored in as well.