Being a DTAG customer is not that great in Germany either.
For mobile they gave me a new 100% unlimited (data&speed) contract for 25€ a month. Cant really complain about that. For home internet its been rock-solid and I cant think of even one disconnection in the last years. Peering is better than Telekom as well.
I do understand that its not universal.
But O2 is a pretty good alternative. Especially if I consider than I pay one third of the price that a similar contract would cost me with Telekom.
Luckily, things have improved and network cells aren't overloaded all the time.
In the countryside, all networks are hit and miss.
However unlike mnet and Vodafone, DTAG never works, since they overload their peering links to other internet providers on purpose. This means that accessing any website or service that isn't explicitly paying DTAG to get unrestricted access to their customers, performs very poorly. See for example Youtube being barely usable in evenings for years. None of the other internet providers had that issue.
Sadly people in Germany will just blame the site being bad/slow, instead of having a closer look at their internet provider.
Yes, this is what I was trying to say. It's a while ago, so perhaps I remembered the details incorrectly.
However that's not my point. My point is that the service DTAG offers is just inferior and people that were never exposed to something better (be it never tried or just got unlucky with the alternatives when they tried), just stick with it. I would never get internet from them in Germany simply because I value having good internet connectivity (not just germany-net) and want data to flow a little bit faster than during the isdn-dialup days. The mafia-like behavior (of requiring payment from hosting providers to get usable connectivity to their customers) is just the cherry on top.