That is a good proportion. In some proportional representation systems, as in my native country of the Netherlands, the entire country is one district. While that has worked well, I would not recommend it for other countries. I would not recommend it for Canada.
I think the advantage for voters of having more than a single representative elected in a district, and members of different parties being elected, is that they can still go to a representative with questions or comments on what the government has been doing. If those voters in the past have not voted for the representative who won the election, now they have the advantage of going not only to a representative of their district, but to a representative whom they actually feel comfortable with and they have voted for.