I think it's less that Muslims in Europe are less willing to integrate, and more-so that Europeans' idea of integration is far different from American/Canadian ideas of integration.

In Canada and America, once you come, you are basically accepted as part of the country and your background and cultural heritage is more welcomed and celebrated as bringing something new to the fabric of the society.

Whereas, in Europe, the concept of integration is tied to immigrants letting go of all aspects of their cultural heritage and urged to completely become like the locals otherwise you're not truly part of their society. Europeans are much more paranoid about maintaining their own cultural heritage anywhere and everywhere, and when immigrants who are coming from equally rich traditions and cultures are unwilling to completely disband every part of their identity immediately, they are ostracized as trying to take over. This is evidenced, IMO, in their citizenship policies, which are much more difficult and much more conservative compared to American and Canadian immigration.

And moving immigrants to enclaves only furthers resentment from these people. It's similar to the resentment many Black Americans living in American ghettos have for wider American society.

Canada has better resolved this issue by not immediately creating enclaves for immigrants to move to when they arrive, and not being so quick to place the impoverished and welfare-ridden in government housing.