I liked the concept: gangsters running the port in Barcelona, with some family drama and internal tensions. The actors were good. At first, it wasn't trying to be too clever.
As the episodes wore on, the bad writing kept decreasing the enjoyment for me, until I positively disliked watching the last two episodes. I kept watching hoping it would redeem itself, but it only degenerated into implausible subplots and gratuitous diversions.
Others have pointed out some of the poorly written scenes, but it's even worse than that: the timelines don't even match up. Miki will head out in his car at night and then arrive in broad daylight, even though we know the two places are not that far apart. Other times things are happening with characters that are clearly meant to have happened before other scenes. I'm not talking about the flashbacks, which are also annoyingly overdone and distracts from the main storyline, but at least they make it clear when it's a flashback.
With only slightly better writing, this could have been a good watch. As it is, I recommend skipping it.