From a Swedish point of view, the sinking of M/S Estonia is the disaster that has caused the second most deaths in modern times. By far. It is only the tsunami in 2004 that has taken the lives of more Swedes. As is so often the case with this type of major events, there has been an aftermath with some conspiracy theory elements.
The event itself contains a lot of drama, and would therefore be grateful for a fictional depiction. However, this TV series manages this opportunity rather poorly. Much of the series focuses on the commission that was set up after the accident, which was supposed to investigate what the cause was. This is mixed with flashbacks from the actual course of the disaster.
The Commission is portrayed as a dysfunctional collection of people, to say the least, where not least the Swedish participants seem particularly unsympathetic and unprofessional. It's pretty much only the Finnish hero who behaves. Since the process is depicted so fragmentarily, it is difficult to get any context around the strange behavior that the characters exhibit.
The story is generally far too unfocused. There are many people involved whose story is told too briefly to get any understanding or any real commitment. This makes this basically very dramatic event in this fictional depiction quite boring.
Maybe they should have spiced it up a bit with a love story between a woman from first class and a man from third class. A scene where they stand in the bow and pretend to fly, to a ballad by Celine Dion might also have worked. But these ideas are perhaps already taken by someone else.