1980ies was a really critical decade in the post-WWII period, tensions were the highest since the 1960ies, as the economical gaps between the East and West started to enhance faster. The split Germany encountered apparently the biggest tensions as the nation/language was the same, NATO bases were close, and GDR intelligence was considered among the best in the world...
Although I was quite young at that time, Deutschland 83 seems very realistic to me, brings forth some memories and attitudes East Germans were known in the Warsav Pact block... True, some topics were apparently "bedighted" and intensified for the sake of feature series and providing meatiness and additional warmth and humour, this mini-series is no US-type of action mockery, with constant chases and blasts. For younger generations accustomed to search engines etc., some events may seems odd and questionable, but back then all checking was much more complicated and slower.
The cast is evenly strong, I found Jonas Nay as Martin Rauch / Moritz Stamm, Maria Schrader as Lenora Rauch, and Ludwig Trepte as Alex Edel most elaborated characters/performances. But still, it is good that all speak their native language (or broken German), and being made on German soil and cities, you can feel the real European/German life and background throughout the whole series.
The ending could have been more twisty, but still, a good series. Special mention to those who selected songs and soundtrack - one can hardly find more suitable melodies and texts for specific events and general atmosphere.