I'm up on my knowledge of Canadian & American business, politics and economy because it is a big part of what I need to know for my professional work; I'm also from one country and getting married to someone from the other, so, hey, it's part of what I need to know in my personal life as well. I don't need to look up exchange rates, gas prices or commentary on the comparative quality of roads, health care and education, or on the state of politics because I live my life in both countries, see these things with my own two eyes, talk to quite a number of people in both countries, and compound that with a lot of research.
That's the starting point for my perspective on things. Almost by definition, it's going to be more a informed perspective than people who recite the dross you get from self-described patriotic conservative talk radio hosts, or where-ever the hell it is some Americans pick up the kind of badly-informed, unrealistic viewpoints that aren't grounded in actual reality.
As for Canada's GDP, when measured per capita it is more or less on par with the United States, though usually behind by a bit (depends on how you measure it). Canada's GDP to debt ratio has also been close to the United States, but unlike the United States, Canada has been running budgetary surpluses, not large deficits through the 2000s, so that's been tilting in Canada's favour.
That said, I'm not really much of a believer in using the GDP alone as a proper measure of the success of a nation. Spending lots of money on stuff is only part of the equation. Is the money being spent in the pursuit of feeding the personal greed of the few or improving the quality of life of the many? Is our children learning? The Human Development Index does a better job of measuring the real effectiveness of both public policy and private spending. Canada's GDP per capita may be lower, but.... so? The quality of life is measurably better.
And which is more important to you as a functioning human being? Money or happiness?
(that question always reminds me of a story: A catholic friend of mine went on a church mission to the shantytowns
in the hills surrounding Lima, Peru. Destitution is widespread there . But, she found that many of the people there were happier and more at peace with their life than just about everyone she'd ever known in her home state of Connecticut.)