Many immigrants I know either regret or are ambivalent about coming here; this is especially the case for homeowners and those with good jobs in the professions back home. They sell everything to raise enough money to come here, but have to start from scratch with respect to jobs and property.
This is often the case for people from the second world like the Eastern bloc. Sure, people from much poorer countries might be better off here, but we're not the world's charity.
Moreover, as NL stated, they're seen as cheap labour. I would also add as a cash cow to create more demand for goods and services, including housing. There's no incentive to recognize their credentials and experience. So they end up languishing in menial jobs, becoming resentful and creating a lose-lose situation for both the immigrants and Canada.
That's almost exactly the year Trudeau began the surge.