I live in the US and it is so annoying having so many people who don't speak English, or speak it clearly at any rate. There should be immigration laws that require immigrants to be able to speak English, or Dutch in the situation in the Netherlands.
Also, the existance of ghettos is a bad thing because the allow people to think that it is ok to speak in a different language other that the language of the country of their current residnece. That is not good since it makes it harder for them to be accepted into the general society of their new home. Creating ethnic hate groups against them. That creates problems for the government, costing them more taxpayers dollars to increase security, which leads to general dissent among the native populace, and thus resenting foreigners even more.
I STRONGLY dislike the amounts of immigration from Islamic countries into European countries since they are not truly welcomed there. For instance, the Turkish workers in Germany are unwelcomed because Germany has been rebuilt and they are no longer welcome. So now Turks are becoming desperate and Neo-Nazis are on the prowl waiting to beat them up.
The situation in Europe does not look good. Remember that the racists of America are generally of European descent. Not to say that most Europeans are racists, but there are enough to make Europe an unfriendly palce for immigrants.