If it helps, Bingo, there seems to be an American take on the word "opinion", which I've also heard, less frequently, in other countries. In this American sense, an "opinion" is completely disassociated from facts and thus is impossible to objectively measure. It also, in my opinion (ha!), makes the word utterly meaningless.
The traditional meaning of "opinion" is only reclaimed by adding qualifiers, such as "professional opinion", "doctor's opinion", "the court's opinion", etc. Then, suddenly, people understand that THIS sort of opinion is tied, to some degree, to facts, expertise, etc and can be measured as better or worse than other opinions.
It's maddening, I agree, particularly because the new sense of the word is so useless. But there you have it.