...and you'll have to watch all 6 episodes to get it. (S1) You should not compare it to "Die Welle" or any other movies following a similar theme (the experiment with totalitarianism), because that is simply not the point (until now, at least).
This is a well scripted and well paced story about youth anger, and what will happen if you push it too far.. The main characters are quite believable (I'm from germany, like the series, and these kids could be real for sure - your mileage may vary). The appearance of a far right german party (they only changed the name) mirrors actual political events, and is a trigger, but the story is not reduced to "far left against far right".
The cast is very good, especially the leads. They put only 6 episodes into season 1, which makes the story quite compact, and also managed to put in quite a lot of development of the main characters, which is very pleasing.
I'd be very happy to watch another season.