Can we trust any reviews these days? They either seem to be 10/10 or 1/10. Both of which are complete nonsense, no doubt driven by personal politics rather than honesty.
It's a mediocre book, a slightly better TV adaptation, but the acting is wooden, the general story an unimaginative cliche. About par for the BBC. If you're zoning out in front of the TV, it's ok. Definitely not worth changing any plans for though.