I just found this nice article that shines an interesting light on the whole Sweden-debate this topic started with.
Apparently the problem is that Sweden is only so very tolerant according to its laws and in theory, but in practice minorities, including immigrants, are marginalized, don't get jobs and are often victims of hate crimes.

So the idea to portray the idea of integration of immigrants as a failure of the immigrants to integrate is quite wrong, given that swedish society is not nearly as inclusive as the outside image suggests. What people from the right call the "failed experiment" never actually took off, there was no experiment, just an attempt to start one that most people then rejected and didn't participate in. And now, as usual, the racists blame "the others", whom they refused from the outset, for not integrating well enough, "despite all those efforts" that never actually happened.

Article: http://www.aljazeera.com/indepth/opi...245833711.html

Like the rest of Europe, Sweden prides itself in its constitutional tradition based on a "respect for the equal worth of all and the liberty and dignity of the individual", as its constitution says.

But as the UN Working Group of Experts on People of African Descent concluded on its visit to Sweden the same week that the Sweden Democrats forced the country into early elections:

"It is our view that the Swedish philosophy of equality and its public and self-image as a country with non-discrimination and liberal democracy, blinds it to the racism faced by Afro-Swedes and Africans in its midst. No country is free of racism and Sweden is not an exception."
We can conclude that the problem is not too much multiculti, but too little of it, even in Sweden...