suprised at the 5.5 IMDB rating

I was surprised as well. I tought 7 or 8 at least. I gave it 8 stars ********! (after 3 episodes).. and going to watch all the episodes. I like it.
My favourite series are at the moment...
The Man in the High Castle (9 stars),
South of Hell (8 stars)
and
The Expanse (9 stars)...

Its flat. The acting from the brother is awful. The story concept is the only thing I like, and I really really like the concept, but like Constantine series, the implementation is just bleh.

3 Stars, solely on the concept.