I assume the reference to "Doctors without Borders" is chosen because of its catchiness and not because the murderer(s?) acts from humanitarian motives, but that is yet to be revealed. A twist like that could make the criminal plot more interesting. The characters seem promising though.
The Copenhagen lead investigator (male) has history with the German lead investigator (female) and at first he is reluctant to take the case. As his pregnant wife persuades him to get on the case, I would expect some extracurricular drama on that front.
Another theme that echoes from "Broen" is the collaboration between a Danish male police officer with people skills and a Swedish female officer with hard skills. As opposed to Saga in Broen, this lady is it-savvy and seems to be functioning normally on a social level. I look forward to seeing more of that smooth Scandinavian duo.
The Belgian team promises to be entertaining as tension between the passionate female lead and her arrogant male assistant is thick. They are quick to criticise each other and clumsy performance by the Belgian team seems likely to be a theme, which could easily evolve into a farce.
The case they are working on is not as intriguing, and I struggle to see how many episodes the team can spend solving it. The viewer already knows who did it and why, unless some unforeseen twist presents itself. The personal drama in this series is much more promising, in terms of entertainment, and I am looking forward to seeing how the collaboration evolves.