As we've seen in this thread and others, people's loyalty to a particular line can run deep.
Most of us have spent a lot of time this week talking about the couple who were banned for life by RCI - the banning that SailorJack refers to - and then this thread comes along and is ripe for dissection.
Reading between the lines of the "love it or leave it" posts, what I come away with is this: just because you had some issues with RCI, don't assume your next Princess cruise will be as good as your last one. Every cruise ship has "one of those cruises". For instance, the fire that took out the port side of the Star Princess a couple years ago.