It's true that Canada's fiscal situation is quite strong, especially compared with other G7 countries, so I have no reason to disagree with the overall Standard and Poor's assessment. That said, Standard and Poor's is in a different line of business from mine. They're in the business of assessing credit risk for sovereign countries and subnational countries, whereas I'm a couple of levels down, trying to determine the long-term fiscal sustainability of governments as well as the costs of certain specific measures.
However, there's no fundamental reason to greatly disagree with the Standard and Poor's assessment.