Like what? Molson might be the Budwiser of Canada in terms of popularity, but it beats Bud in taste hands down. In fact it might be the best domestic lager I've tasted. Kokanee Glacier Beer is another good Canadian lager. But that's it for lager unless you're thinking of local beers or expensive Belgian ale like Fin du Monde,
Maybe it's because I'm used to Molson, so that's why I don't see the big deal with it. I just find it surprising that Americans
really love Molson.
When it comes to general [popular] lagers. There's Kokanee as you pointed out, Alexander Keith's is quite decent as well. Some of the Sleeman beers aren't that bad either. I know a lot of people that like Moosehead, it doesn't do much for me though.
In regards to local beers, I'm in Quebec which is microbrewery central, so there are way too many to name (La Fin du Monde, as you pointed out, is a Belge style'd Quebecois beer from a small place called Chambly).