[dhimes]

That's like saying Facebook is good because everybody uses it.

[fellellor]

Or Cocaine. If you try it a few times, you won't ever want to stop using.

[wavefunction]

Cocaine isn't that addictive, at least not for everyone.

It's more like cocaine is "obviously good" because millions of people around the world use it. I think that's a more apt usage of cocaine in the OP's estimation of popularity === "good."