There probably isn't a one-size-fits-all review of this series, which is based on the books of PD James but has the difficult task of following on the screen versions of the books produced by Anglia in the 80s (starring Roy Marsden). The Anglia series were remarkable for stretching most of the books out over six episodes, which gave them the opportunity to dig into all the characters. They were slow, but purposefully so.
The new versions condense each book into two beautifully shot 45-minute episodes, which means something that may have been one or more scenes in the 80s version gets condensed into a sentence. For me, this means the new series feels rushed. However, if you haven't seen the previous versions, you may not notice. It's definitely a quality production, and so should satisfy your need for a mystery. But ultimately it feels formulaic.
The new versions condense each book into two beautifully shot 45-minute episodes, which means something that may have been one or more scenes in the 80s version gets condensed into a sentence. For me, this means the new series feels rushed. However, if you haven't seen the previous versions, you may not notice. It's definitely a quality production, and so should satisfy your need for a mystery. But ultimately it feels formulaic.