While this is your average crime/thriller story, with a new mystery every 2 episodes and one that spans over the whole series there are several factors that would make me choose this one over several similar brit-crime variations.
First: I really enjoy the setting. Istanbul is an exciting city and the series manages to capture the vibe quite well.
Second: The script. Each episode is well written, and balanced both in dialogue, character development and in mysteries that somehow feels like a fresh take than the average (maybe it is the environment, maybe the somewhat straightforward storytelling, either way, it works).
Third: likeable characters and good acting. The characters are believable and likeable but not without faults. Thankfully the depressed-alcoholic-cop-trope is no way to be seen. Rather the characters are more multifaceted with have weaknesses, strengths, doubts and sides that are less flattering, just like all humans. Perhaps that is why they feel so relatable.
Over all, the series are evidently well crafted, and enjoyable. Nothing mind blowing, but an enjoyable watch. If you like series like the Icelantic "Trapped" or the Danish "Rejsholdet", this is for you.