Yeah, I agree on that point. On one hand he's not the greatest singer, but he gets the job done... but what he does great, is he gets the emotion in there, and carries something over. I'm not sure my Pictish/Irish/Celtic/viking warriors took singing lessons...
Artsy Fartsy Reviewer type statement: "It's not pleasing to the ear, but it has a raw and savage edge, that makes you think that he's the leader of a tribe of pillagers about to rape your wife and children yelling his plans to you. You piss yourself, and wish you could join them."
or some shit.