I gotta admit I try constantly to listen - the problem with most of these groups, to me, is that they play too clean - it's like roots music for people who haven't really listened to roots music. Too slick, the articulation is wrong, the language is wrong - the best of it sounds to me like they listened about as far back as The Band - and I love The Band, but the Band was already The Band, if you know what I mean. Time to go back to Fiddlin' John Carson, Kelly Harrell, Clarence Ashley, B.F. Shelton.....
And ironically or not, the techniques of post '60s free jazz will get you there faster than slicked-out bluegrass.
Mindy sounds ok, but like about 12 other singers I've heard.
All this is, of course, just my opinion. And one guy I like a lot is Eric Royer, from Boston, but that's about it.