S1 starts promising and then drifts into soap. S2 stays soap. There is an interesting idea behind this, but they've buried it beneath subplots which do absolutely nothing to the story. S3 adds two characters which have no meaning at all, but get lots of wasted screentime. It is slow. For every bit of the main story, you have to wait and wait and wait... until S3, where they give you something, but not much. And after wasting lots of S3's time, they rush it to the end, without any clever ideas, which I really hoped for.
Don't blame the cast, they did well.
Don't blame the cast, they did well.