Regarding the appropriateness of technicaly poor voices in folk/roots music;
I've occasionaly been playing Jeff Walker und Die Fluffers "Welcome To Carcass Cuntry" as background music
while I sort out my daily doings.

The singing quality would seriously make Shane MacGowan sound like Charlotte Church.

But once you get past the adolescent novelty of a bunch of death metal / grindcore 'artistes'
paying homage to country blues standards, its actually to my ears quite an effective and respectable tribute
to a genre of hard working beaten up 'manly' music.

However, Shane MacGowan , Billy Bragg, or anyone remotely with a voice like that were not performing on this xmas special;
so apart from technicaly good singers performing a little under par,
I can't personaly find any cause for complaint with the quality of the performers.

Again I think the main problem with this xmas special
is the self-indulgent wanky 'in-crowd' presentation.