I agree with Dave's sentements, if you wanted to make a "best" gun, which is exactly the point with Rigby, there would be substantial effort and investment with a very limited customer base.
Outsourcing parts to firms such as Joseph Brazier ( http://www.josephbrazier.com/index.html )would go a long way toward producing a great gun in a contained cost manner, but I suspect the finished product would need to sell in the $60K plus range to break even.
As I see it, the US Rigby folks are not producing a bad gun, just bad when compared to the guns of the past bearing the same name. Obviously, they would have a very hard time selling any of their guns if they didn't own the Rigby name - especially to those in the know.

It seems to me, if compared to Merkels, Chapuis, Krieghoff, Searcy etc., which are really the competition for the Rigbys where build quality is concerned, they would have their place in the market at decent quantity as well. They just happen to command (or at least try to command) a premium for the name. If they dropped their price $10K, where it should be, they would put up a good challenge to any of the formentioned makers.
And, I must admit, if in the position to pay $12-15K for a new gun, the Rigby may rise to the top of the heap. For $25K NO WAY!! Anyway, I honestly do not know why anyone would buy a new DR unless they can afford a high end London gun.