Well, I'm not too sure about the situation at
this exact moment since, as a non-native, I usually only watch shows after they are made available to me and not as they air, but I can think of quite a few British shows I've enjoyed in my time. In no particular order (except The Thick of It being on top because it's the best):
- The Thick of It
- Black Mirror
- Sherlock
- Peep Show
- Dr. Who
- The Office
- Luther
- The IT Crowd
Just a few I can think of right now. Certainly more than German ones I can think of right now, and this doesn't even cover non-fiction shows like QI or Top Gear or the BBC's excellent documentary output. Though you're right that there would be more American ones, probably, but that doesn't mean Britain's output isn't noteworthy.