I lived in Berlin for 10 years. In my experience, people complain too much about German public transport. But comming from a south american country with reasonably good public transport, I found German's one very good.

The only thing I can agree is the "speaking only in german as if it was the lingua franca of the world". Germany is part of the EU. The EU has 24 langueages. You should at least speak in English. And no, my mother language is not english but spanish.