Inflation(read: gouging) is a massive problem which isn't being tackled, housing is unaffordable, and the medical systems are underfunded (due in part to the exploitative US system). There's also some conflict in our relations with Mexico which I'm personally pissed about but I don't think most are concerned with.
The opposition party is headed by a far right "populist" who claims the current status quo is "authoritarian socialism" and is supported by Jordan Peterson and Elon Musk.
Liberals are upset with Trudeau for failing to fix the issues listed above and offering no counter to some of the legitimate populist policies Pierre champions.