F.B.I. - Dem Verbrechen auf der Spur

Every single episode is started with a monologue, where the narrator spoils the entire episode and even reveals exactly how the key evidence was found.

It's painfully obvious that this was not a decision by the creators, but rather by the narrator demanding that every episode start with a close in on his face. Whether it's for self-promotion, or that he sincerely believed we viewers want to see his face more is unclear, but this makes the entire series unwatchable.