Both my DC have been to Germany via exchanges organised by their London private schools. Exchange partners were from highly regarded Gymnasiums in major cities. Impressions were of rigid syllabi, large classes, shabby facilities, limited EC and limited diversity. Though obviously using a selective London private school as a starting point is gong to encourage less than flattering comparisons. That said, inevitably, the German students had fantastic English, far far better than the German of their English counterparts.
I wonder if Herr Holle is aware that public funding for education across Europe is under stress across Europe, and that Germany along with France, Britain and elsewhere has plenty of debate about how best to organise secondary education.