I think it's part of me hating contemporary German dubbing of TV shows (*shudders*) and I am mostly in TV fandoms.

That might be it. And I suppose you don't watch German TV shows, right? And I do admit, some dubs are horrible. The old Rainer Brandt ones, however ...

That said, I don't mean to say that English fandom is better than German fandom, I don't know enough of the German one to form an educated decision.

I didn't think so. Some people just prefer English fandom or media and I don't think there's anything wrong with that. I just love writing in German and I long for German goodfic (which I unfortunately can't find. *sigh*).