I thought this series was a bit of fun and really enjoyed the implausible plot lines. It's a bit different than most BBC output but I personally don't think that's an issue, at least not for me.
The recent Sixth Commandment with Timothy Spall was a great limited drama series, almost an uncomfortable watch as it's based on a true life crime. It was excellent television.
This is very different. I really did enjoy the two detectives, some hilarious moments. Hopefully it was intended as a dark comedy because I thought it was a riot.
If you like your drama come thriller specifically on point then you might not enjoy this. I will watch pretty much anything and I'm not fussy. I personally find most television very forgettable, mostly due to the dearth of shows available to watch. Don't take this too seriously and you might enjoy it.