Well, if the Cormorant is any good, it is because the British taxpayer has bankrolled the R&D required to turn the original EHI01 into what it is now.
The RN have ironed out a lot of problems with the Merlin and 28 Sqn have battled through, using the support helicopter with the comedy ramp option.
The Canadians are now the testbed for the Cormorant, so the Danes (who should get theirs in the near future) will probably benefit.
All Westalnds helicopters leak, vibrate and crack - the problem with the Cormorant is that it is mostly made of composite materials which are far more difficult to repair and nearly impossible to carry out NDT (non destructive testing) on.
Although the Danes carried out trials and convinced themselves they could live with the fierce downwash, I believe the Canadians are not impressed, the high disc loading and Berp style blades combine to make life underneath the aircraft very unpleasant - what a great SAR machine!