The McCord Museum mainly showcases the social and cultural evolution of Montreal. There are two permanent exhibitions: the one located on the main floor focuses on the First Nations people of Canada through their garments and culture; the second one located on the first floor focuses on the history of Montreal through objects, pictures, and paintings. They have numerous temporary exhibitions throughout the year, tonight I've visited the Notman exhibition.
Don't expect a huge museum because it is very specialized and small compared to others in the area, hence my rating (3.5). The proposed collections are not that extensive (although interesting) and the admission fees are a bit too high compared to other museums in Montreal with way more appealing content (20$ for the Museum of Fine Arts as well).
As this year marks Montreal 375th celebration, I'm sure they will have original exhibitions so I will probably be going back in the near future.