Canada invoked the Emergencies Act in 2022 when the national capital was occupied by a convoy of antivaxers who shut down the city for days. There was some debate as to whether it was necessary and there was an inquiry afterward. The main reason for invoking it was to allow the federal government to use law enforcement since the Ottawa municipal police mostly sat on its hands during the whole debacle.
Also in Canada, the War Measures Act was used during the FLQ Crisis in 1970. While some may disagree with using martial law, I don't think many would say it was used in a corrupt, power-grabbing way.
As a Canadian, I can assure you everyone on the right considered it a corrupt, powergrab. Whether or not you agree is of course up to you, but it's not a clear sky case
Of course everyone on the right didn't like it, because "Fuck Trudeau" is the extent of their political understanding. It was overkill in hindsight, but in the moment, with the capital paralyzed and armed terrorists in Coutts, some benefit of the doubt must be given.
I read he is blocking the National Assembly building to avoid the martial law being lifted; both parties, including his, will vote to lift it should they get inside