It's not a format I like, that we see the murderers at the beginning of the episodes and then watch the supposed detective work to catch them. As this TV series is based on a series of crime novels, I assume that this is the system used in the books. In either medium, this would be a deficiency to me.
I can guess at why it was done this way. Both of the stories I watched (it's one story per two episodes) involved or less random crimes. It would be really hard for a viewer to guess at whodunnit. Agatha Christie this is not, it's more like Columbo which I also never took to.
I loved seeing parts of Helsinki that I know or have been to which is why I gave a three. But I just knew that I have better things lined up to watch which is why I deleted the lot.
