Those two differences are a pretty harsh judgement on the wisdom of the crowd (or they should tell you you aren't using an especially culturally diverse crowd).

Those two differences are a pretty harsh judgement on the wisdom of the crowd (or they should tell you you aren't using an especially culturally diverse crowd). More sympathetically, Album vs Band seems like a confounding factor... the Beach Boys released some astonishing albums, but their overall standing as a band has to also consider the drivel they released. OTOH, Linkin Park are enormously popular as a band, but (in my memory as an alt-rock obsessed teenager in the 00's) none of their albums really broke the surface (relative to the ludicrous levels of play their singles got).