I think a lot of people whose first love is rock music (sorry to use such a general term) have listened through exaggerated, harsh speakers for years. Heaven knows I did.
When Zeppelin, Kiss, Queen, etc. are played through Vandersteens, it can throw someone's ear off, because they're not used to that smoothness and accuracy.
And that gets interpreted by some people as not rockin' enough, which is a shame. To my ears, Vandys are a cleaner, more truthful way to hear any music.