I suppose I am not surprised at a lot of the negative reviews here. This is a subtle show. If you like your science fiction without starships, loud photon torpedoes and men throwing cars at one another --then this might well be for you!
The direction, acting and script are all top notch. The pilot episode gave a taste of everything you can expect form the series, whereas the series has settled into a slow reveal as it answers the questions posed in the first episode.
J.K.Simmons is exceptional. The subtle changes in personality, bearing and voice he portrays, enable the viewer to see the different characters even from a distance. None of the other actors (so far) have to try their hand at this form of subtlety, but JK (an actor I've always liked) is brilliant at it.
The setting is superb. Berlin is such a refreshing change as a backdrop to this story and the truly international cast also bring something to the table that is not in a lot of other shows these days.
As I said earlier, this may not be for everyone, but if you like good acting, great locations, good production values and a slow burn, solid story then this is for you!