He's been PM during times of hardship. That's pretty much it. That and Conservatives parroting for the last 5 years that every single thing wrong in this country is directly and individually Trudeau's fault.

Most things blamed on Trudeau are either international events affecting every country, or stuff that's actually under the jurisdiction of the (mostly Conservative) provincial governments or municipalities.

He has done some things that are actually worth resenting, but most Canadians criticising Trudeau don't give a fuck about blackface or corruption scandals, they just want to whine about carbon tax and minorities.