I'd say they all are. How worthy they seem usually depends on how much they fit with our own
Of course, they can all be evaluated and taken seriously or ignored (especially the rude ones and the extreme ones).
I dunno. An opinion is an unverified belief. Every opinion is ultimately true or false. Different opinions can be based in different amounts of informedness. A doctor's opinion on a medical condition might be more useful than that of someone with no medical training. Or, maybe a patient's opinion on their affliction might be accurate while a doctor's opinion on their affliction is wrong.
It might be difficult to tell whether one opinion has more merit to it than another, but maybe not in every case. But one thing they all have in common is that they are not fully verified and there is more information needed for their pictures to be complete.
