This study [0] (sorry it's in German, English reporting on it: [1, 2]) supports your claim that integration is more or less equally bad across the studied countries. Different countries fail at different aspects of it.

[0] http://www.bertelsmann-stiftung.de/fileadmin/files/BSt/Publi...

[1] https://www.thelocal.de/20170824/integration-of-muslims-bett...

[2] http://www.politico.eu/article/muslims-integrate-in-europe-d...

EDIT: originally I misread that OP claimed that other countries did better, changed wording accordingly