Strictly from my perspective.

What Sweden has gained from multiculturalism:
- Richer food culture.
- More understanding of other nations.
- People who work harder for less.

What Sweden has lost:
- We now have ghettos.
- The use of derogatory names for girls are being common.
- The sense of "The big home", we used to pay high taxes to support our less fortunate citizens (and that was ok), now we find ourselves paying even higher taxes for originally somewhereelses citizens (and that is not ok). Can be seen in the fact that we used to be socialist when we were only Swedes with minor immigration, whereas we have now moved to a more cold society with colder laws and general structures in society at large.