The linked article indicates that Canada's integration of immigrants has regressed and that newer immigrants are having a more difficult time accessing, amongst other areas, the labour market; education; healthcare; and participating in the political process.
This news must come as a shock to the Harper government, whose focus on economic immigrants with English or French language ability and skilled Canadian work experience or education was touted as a way to ensure easier resettlement and integration of immigrants into Canada.
It appears that the government's policy failure was because, despite the warnings of many, they have imposed restrictions on family reunification and citizenship. This has resulted in immigrants feeling less included and failing to integrate more fully into Canadian society. While not covered in this article, one cannot help but think that the "Fortress Canada" mentality, which has been supported rhetorically by Conservative politicians, has also played a part in Canada's fall from 3rd to 6th in these global rankings and in a more tangential sense of belonging for new immigrants and a correlative colder welcome from established Canadians.