As an American who has frequently visited Canada, I can say that I wish American politics could be more like Canada's - a fluid, multiparty system rather than the sclerotic duopoly that we have. For my part, I would welcome the chance to vote for a truly relevant left-leaning party.
On the other hand, the Westminster parliamentary system has always seemed undemocratic in that the party in power can call an election whenever it chooses; also that, without the separation of powers in a presidential system, the majority party can pretty much do whatever it pleases, checked only by public opinion. (I know there has been talk about going to regularly scheduled elections. Did that ever happen?)
It has always seemed perplexing to me that Canada can be so progressive about matters like secularism, minority & indigenous rights, & universal health care, but be so defiantly retrograde on addressing climate change & environmental protection, though I think this might be a consequence of having an economy based largely on resource extraction.
The two major things I've noticed about politics in Canada, in comparison to the U.S.: 1) power is much more decentralized - provincial elections matter in a way that U.S. state elections usually don't; 2) politics is more parochial - not so much about left/right ideology as it is about delivering the goods.
Canadians, please feel free to correct me if you disagree with any of this. I don't know what it's like to live there, only that it's a wonderful place to visit.