When you have a simple journey and no interruptions DB in long distance is pretty good, not excellent but solid. But with more complicated things traveling with DB is not well thought out and they don't see what could be possible. Changing a platform should show you in-station navigation door to door. DB navigator should not show you impossible journeys, it presents you with train switches where the second train already left once you arrive or displays the stop is canceled entirely. DB Navigator and bahn.de have a monopoly over german train routing and ticketing, but are not subject to anti-trust regulation enough or run by the government directly (dataquality issues, etc). DB is very much against grassroots movements trying to improve customer experience and quality, like community built ticket stores or wallet and calendar integration. I also think the ministry of transportation and politicians are at fault for not getting DB to step up their game. Trying to privatize DB, rigid regulations for how DB has to run and not enough attention to rail as a whole for example. I would consider the "ampel" (21-24) to be one of the better ones. After some reforms, the government is still not in a position to control the monopolist enough.