Germany has very few fast trains ... going fast (not many train tracks are built for fast trains). It got better in the last few years, but there is still a lot to do (and catch up with France). As for the "regional" trains (that this offer is talking about), they go really slow and are just for people commuting. This kind of monthly offer would be sort of interesting if it were to apply to the ICE trains, as currently the price is very prohibitive (e.g. I paid last week ~90EUR for a second class ticket from Frankfurt airport to the nearby city of Cologne, not even 200km away - driving a Porsche is cheaper per km...)
As for the reason of many of the delays, it's good to know a problem specific to Germany (and e.g. not France). Human transportation trains and freight transportation trains share the same tracks. And freight is obviously very slow.
> As for the "regional" trains (that this offer is talking about), they go really slow and are just for people commuting.
That really depends on which line you are on. For example Munich - Nuremberg (~170km) takes 1:45 by regional train. That’s pretty competitive, going by car takes the same time. The ICE train on the same track needs 1:10.
As for the reason of many of the delays, it's good to know a problem specific to Germany (and e.g. not France). Human transportation trains and freight transportation trains share the same tracks. And freight is obviously very slow.