I cannot comment on the standards of training and assessment around the country because I don't travel around the country being trained and assessed. so nothing to compare it to.
I have however been in Canada, converted my ISA to CYA and instructed the CYA 'CanSail' system.
They are a large country and their CYA manages to keep the standard between the west coast, lake (middle) and east.
They control their standards by issuing online modules for instructors to complete, setting out CYA policies and objectives.
They Issue actual resources which the ISA don't , well not really. (copy and paste the RYA manual).
From what was different in the new CYA system was the instructors were GIVEN session plans. the whole level is broken down into checklists and detailed session plans so all the working out of the trainees advancement was pre-worked out properly (with room for adapting per instructors requirement)
and more importantly to a certain standard.
Here is a part of the video that explains this, in the club I worked for.http://www.youtube.com/watch?feature=...
With this way of standardizing it took a huge weight off the individual instructor as the sessions were preplanned. It also made very average instructors very good at covering all the points and running sessions that they would never have thought about themselves.
EDIT: May be moved to apporpriate thread