What I can add to this is that I've often seen New Zealand as quite good. Also, some of the material I've seen in the United Kingdom is almost shockingly transparent.
As for here in Canada, when I think about the different jurisdictions, Dr. Rose is right to say that things are prone to change. I think one comment that hasn't come up and that this made me think of is the fact that we now have fixed-date elections. That's actually a very profound element of what is going on in Canada, not just at the federal level, but at the provincial level, with the exception of one province.
I've just co-edited a book, Permanent Campaigning in Canada, and the idea that a number of us as scholars identify is that governments are in a constant state of campaigning. Every day is about trying to win the media cycle or trying to make sure that they're not being treated in a negative way. It's almost like the campaigning never stops. This is a phenomenon that we see all over the world. It really seems to have emerged out of the United States in the early 1980s.
Your comment made me think of the effect of fixed-date elections and the idea of permanent campaigning, which is not something that has come up till now.