I like this type of mystery series and movies. The series itself did not reinvent the wheel. And it didn't need to. What matters is how the story is told and whether the narrative holds you on all the way.
One of the key strengths of the series was that it was only six episodes long. A longer series would have meant an artificial extension and content. I would like to see more series of 4-6 episodes. With the growing popularity of series, it seems that many film scripts are being turned into 8-12 episode series. Slowly warming up a series is one thing, but artificially lengthening it without adding value is another.
But as I said, this series was the right length and had enough to hold you watching. Granted, the series did contain various silliness, but that's the way it is usually. All in all, the series was quite watchable, but this series isn't memorable. You can easily watch it and enjoy, but after somedays you won't probably remember that's much about it. And that is quite ok.