Also kind of ignoring the fact that the point of insurance is that most people, maybe around 81% for instance, don't need to use it to its full extreme. And obviously those people are going to be more likely to have a generally positive view of it.
I think if you sat people down and showed them how much they pay for health insurance, showed what they got out of their medical insurance, and the actual cost of those procedures, that very few people would rate it highly.
For a system like capitalism that prides itself on market forces, no one has a clue about how and why insurance operates the way it does.