First things first, it's a f***ing burger joint. You find like a 1000 of them in Berlin in every corner and really they mostly look the same and the food taste the same. I think the reason people talk about this one in particular is that it's conveniently located right where you are tired and hungry.
Second of all, the burger isn't even juicy and delicious as everybody says. It's pretty normal and standard.
Third, because it gets sooo crowded due to the fake hype, the service is not that good either. You gotta wait for your food standing sometimes for half an hour.
All in all, I wouldn't say it's bad but don't get your expectations too high!
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