Prediction: You haven't trained a lot outside of Europe if you think the training experience in Germany would be "your worst train experience".

I remember from my interrail planning that big parts of Europe are not nice to visit due to too slow trains. I heard EU wants to fix this though

German train delays are not a big blocker because you normally plan a whole day train travel to go from A to B and being one or two hours late is not too bad.

Yeah saw that one coming from a mile.

Actually no. German trains are often late, true, but outside of that its actually very nice. There are a lots of lines and lots of collections. The only time its a bad idea is if you have a real time constraints.

Germany is quite predictable compared to some other countries.