Well, opinions can certainly be based on erroneous facts.
I'd still say disagree though. An opinion is merely your belief based on the facts you either know or think you know. Opinions sort of go beyond the realm of right or wrong, and merely just are. Perception and factual information can be incorrect. I don't think opinions can. Saying an opinion is incorrect is like saying green is seven. You're ascribing characteristics to something and defining it in a way that doesn't make sense to define it.
In my opinion. :)
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Moops?
"I thought you were making up diseases? That's spontaneous dental hydroplosion."