This is actually not a bad commentary. The two guys, Ifans and director/writer Balsmeyer get along really well and dont talk over each other. Instead, they act as a compliment to one another to add to a full, rich commentary. There's interesting explanations to the origins of the story, stories about the shoot, the actors, behind the scenes on location with details about the locals and all kinds of stuff. Kind of a top to bottom run through of anything and everything.
This movie is probably most notable for having not just one but two actors named Rhys. It's a quirky, corny film but well crafted and it works, just like the commentary.