Global terrorism and mass killings in bigger Western cities have alas become annual reality, so topical films and series may excite additional interest, they are less "sci-fi" than decades ago. On the other hand, technology and surveillance skills have developed, so it is harder to create additional thrill or twists by using wow!-findings or ideas later - they seem fictitious, airy-fairy...
The latter is at times present in Greyzone as well, particularly for them who are eager viewers of (Scandinavian) crime dramas - like me. I am neither agent nor policeman, but methods used / using a scientist in such operations seem rather questionable. True, when setting this aside, the script goes on smoothly, the characters/performances (particularly Birgitte Hjort Sørensen and Tova Magnusson) are pleasant, and the inclusion of different nations/languages provides additional value. But still, having seen dozens of similar series, I find Gråzon far above average, but not conceptual, and viewers outside Northern Europe may find it even less valuable.