Canadian and American urban decay seem to be very different. The postcards of American decay come from cities like Chicago, Detroit, and Cleveland. These cities actually have areas that have decayed away or partially with huge swaths of open urban prairie and random little 1920s houses. They're very empty. Canada's worst neighbourhoods (the postcards of Canadian decay in the urban) are different. They are lived in by the low income, the homeless, etc. They have issues, yes, but are at least lived in and aren't filled with urban prairie. Obviously in each country there is some of the other type, but predominantly I wouldn't say Canada's pictures of decay are actually decay, they're just more run down and lower income with social issues. The big key is many people still actually live in for example the DTES. Not many do in Poletown, Detroit.
That being said, Canada has been pretty spared from a lot of decay than our neighbours to the South I'd say. I can only think of two not so hot areas: the DTES in Vancouver and North End in Winnipeg, but even at that I think there's worse in the US and elsewhere.
Here's some decay in Edmonton. A little sketchy, but a lot better than Detroit (your example) ...
Rougher? Some abandonment? Sure. But much of the neighbourhood is kept up with people living in it. A few boarded up spots and empty lots but otherwise at least it is lived in.