Just don’t queue an hour at Mustafa's - it’s good Kebap, but it’s not that extraordinary. Rüya(m), Superhahn or Servet's make the same style of Gemüsekebap and are just as good.
Hey, my friend moved to Berlin 2 years ago and he takes everyone to Mustafa - is this a tourist attraction / internet one? I don't know why he does this, the kebap is original but nothing special tastewise.
Why go to Germany to get a Turkish meal? Any kebab in Istanbul is going to be better than whatever is available in Berlin. Better get some Schweinshaxe mit Sauerkraut...
Okay I am German and I can tell you I don't know anyone who prefers Schweinshaxe to a good döner kebab. Which by the way, funnily enough, was invented in Germany by Kadir Nurman, a Berliner!
It's basically our national dish at this point and we're arguably better off for it. Our more traditional cuisine is... not so great.
It's still the döner kebab one could buy earlier anywhere in Turkey or MEA just adapted to European city life with different customs and technology. When in Germany visitors should instead taste local dishes not available anywhere else even if they taste weird/bland.