I would posit Mrs Bart's taste is mostly in her mouth...and Jarosz is much more than a "great voice."
She is a virtuoso mandolin player, and also plays octave mandolin, guitar and clawhammer banjo. She mostly writes her own stuff (and has since her teen years), has formal music education from the New England Conservatory of Music (where she graduated with honors) and even as a teen was being called up on stage to jam on mandolin with the likes of Ricky Skaggs. She signed her first recording contract at 16, and released her first album at 17. Has received much critical acclaim. Quite a prodigy for someone who is only 25.
Her stuff may not be everyone's cup of tea, but even if it's not, it is a far cry from and should be recognized as not being "crap".