I watched the beginning of Babylon Berlin and enjoyed it okay - it certainly looked nice. I think the reason I stopped was because Netflix broke it into weird "seasons" so the end of what Netflix called the first season was entirely unclimactic, and I didn't realize until later that it wasn't supposed to be. Maybe I'll eventually pick it up again.
I have mild interest in Gangs Of London from enjoying The Raid movies, although the title doesn't really excite me.