Visually very well and attractively worked out, this drama lacks something in terms of conviction and depth. The dialogues are pretty well portrayed by the actors, but the 'good guys' and 'bad guys' are sometimes portrayed a little too extreme to make it seem realistic. On the other hand, various characters aroused sympathy or irritation in me, so that may not only say something about my sensitivity to it, but also about the quality of this series.
Furthermore, you should not forget that it is a Spanish drama. So: don't watch and review drama if you don't feel good about it. Put the lesser ratings of this series into perspective; watch and enjoy as open-minded as possible.