As a regular traveller to Canada for over 20 years, I can easily support the proposition that Canadians# are 'nice'. Very polite and hospitable. Very good manners.
Sometimes too good. If you look as though you might want to cross a road (but really just thinking about it, or waiting for a break in traffic), often you will find the cars stopping.
They are also very deferential to authority. If you are waiting for the green indicator to walk across the road at traffic lights, its minus 30, blowing a gale and NO traffic on the road, most Canadians will wait, in the freezing cold. Me, I just walk across the road! I've been chastised (politely) a couple of times for this!
# I do not include Quebecers in this. I lived in Quebec for a year, in the north, and it was frankly the most miserable, isolated year of my life. I know there are Quebec residents on this list, my apologies for this generalisation, but boy, the stories I could tell!