I am against immigration in general but with some small exceptions. People should stay in their countries and make them great.
Exception number:
1) A country should be abandoned only if the societies people were born in are twisted beyond repair. In wars only women and children should immigrate and this only for a small amount of time.
2) people should immigrate past their 60ties only if there is a country they always dreamed they go to.
3) massive immigration should be allowed under the idea of the creation of a new nation, like usa which was created by the immigration of millions of people.
In general i want to go to asia and see asians, to africa and see africans, to europe and sea europeans etc... Of course thats only my opinion and nothing more.