I quite enjoyed this series.
I take issue with with the idea that Karine Vanasse was miscast being a francophone Canadian in Northern Ontario. In fact I appreciate hearing Ms. Vanasse muttering in French when frustrated or angry. It is a realistic usage of dialogue in this series. Her placement as a cast member is most appropriate and likely in real Ontario life.
Many Québécois apply for employment outside of their home province. In fact there are Québécois police officers in British Columbia; further from Quebec than Ontario.
As well, there is a substantial number of French speaking Canadians in Northern Ontario. Franco-Ontarians constitute the largest French-speaking community in Canada outside of Quebec, as well as the largest minority language group within Ontario. In fact there is a French term for a French speaker in Ontario - Ontarios.