Yep. I think I agree that popularity doesn't equate to "goodness", but I'm not as confident in the converse. If a thing is universally reviled, can it be said to be a "good" thing? Probably not.
Stickier yet in considering art, in which quality is subjective. If you can measure the quality of a thing by objective means, it's easy to dismiss its popularity as an indicator. Like 1990s quarterback Jeff George, who had a cannon of an arm but was a total jackass by all accounts. He was a good quarterback.
Then there are colloquialisms like "30 million Elvis fans can't be wrong."
I like Toto in general; I do think Rosanna was one of their best songs. I think it's incontrovertible that they were highly skilled musicians. All those are my opinion, but it turns out those opinions are very broadly held, which, I think, is about as good as we can do to establish that Toto, in a general sense, was good.
I like Roseanna (with reservations) too. I thought the opening was brilliant up until the superfluous and jarring
diddily-do-sh'bop! horn bit. Being a former progger I have a soft spot for sus4 and sus2 chords and surprise movement shifts like going down a step after the opening G chords instead of going up to the fourth or fifth as many songs do. But whatever. I think if they just kept it as a straight rock number without all the extra production it would have been a lot better rather than the MOR FM type bit of rock pop it became. But that's me.
As far as goodness and numbers goes, you start running into a situation similar to what's been called the Sorates (from the Greek word for "heap") Paradox.
The Sorates Paradox says:
Collect a large amount of sand into a heap.
Now remove a singe grain of sand.
Is it still a heap of sand?
If so, continue removing sand a grain at a time until one remains.
Now...is it still a heap of sand?
If not, then at which precise point did it become no longer "a heap" of sand?
How you answer that - and there are literally dozens of ways to approach it, ranging from a simple argument for "common sense" all the way up to some pretty heavy mathematical proofs - depends on where you stand on things like Life, the Universe, and Everything.
And lest that sound like academic wheel spinning, there was a famous case (Jacobellis v.Ohio) before the Supreme Court over the issue of obscenity and censorship. The court in this case decided that calling a movie obscene was not sufficient in itself to justify censorship by banning its showing.
What came out of that case was a classic example of the Sorates Paradox, when Justice Potter Stewart said in his concurring opinion that the Constitution protected all expression, including obscene expression except for what he called "hard-core pornography."
But even with that he ran into the Sorates Paradox. As he wrote in his opinion:
"I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description; and perhaps I could never succeed in intelligibly doing so. But
I know it when I see it, and the motion picture involved in this case is not that."
So...who is to say what's good and what's less good or bad?
Bottom line? You are. Otherwise who else is going to make the call?
In matters of aesthetics there's no way to be objective in the scientific sense of the word. However, we can be deeply subjective if we choose to really look at things and spend some time thinking about them before rushing to judgement or making off the cuff half-assed assessments of them. That's where
judgement and
selection come into play. Which is much of what creating art is all about - selection and judgement.
But this is running long and off topic so I'll leave it with that.
Happy philosophizing!

