If the delays, break-down (yes, took place too from Ingolstadt),  or cancellations are not  happening to you personally, it is happening to some one else.  Look at the electronic boards to see who is impacted., listen to announcements  on the platform  to hear how often the delays are taking place.  You just might luck out but not the other guy whose train may be 15 mins to 40 mins late.  
The German family  of  4 adults who decided to share my table at dinner in this restaurant in Vienna  said  that among Germans DB  is "miserable."   I noticed right away she opted for the French  word  to describe.  
Luckily, not every one of my train rides in Germany this summer was late, some were, eg, Frankfurt to Koblenz transferring to Bad Ems was 30 mins late,  Morale of the story there is don't use Koblenz as the transfer point  for  Bad Ems but Limburg an der Lahn, much easier,  Salzburg to Mannheim was 14 mins.  late.   I just factored in a longer-lay-over time than I usually do.