In the same way as in the book mysteries are "seeded" that keep you reading in a classic cliffhanger kind of writing. In between there are long parts obsessed with detail and a lot of graphic sex to wake you up again, the later is way toned down in the show naturally.
The show follows the same structure as the book basically (with some creative license of course), which makes it an extreme slow burner. The dialogue is usually flat and boring but the actors do a good job to get the emotion on screen the book is so obsessed with.
However, the show totally misses the feeling of depression and the emotional empty graphic sex that build the overall narrative of the story and are the key ingredients to create tension. That tension is then "seeded" in between with clues why the protagonist did what she did and you keep reading. The strongest aspects of the book are rendered mute in the TV show.
And that is the problem with the show, it never flames up, it just a fire that is slowly fading, then someone pours oil into the fire at the end of each episode, but the flames are immediately extinguished at the start of the next episode. A similar structural weakness as in the source material, though the the show is not able to hide these from the viewer.
Naturally in the same way as the book all the clues and tension do not really add up in the end and you get pretty much a standard rushed "twist" resolution, most people should be able to see miles away. Anyone who is used to European crime stories has seen this a million times. The ending is rushed, there is no real closure, a problem the source material once more shares.
In addition the overall story and the behavior of the characters lacks credibility. When reading the book you can easily overlook this as you are drawn into an emotional and depressing down spiral. The show is not able to pull the same trick.
The acting and production value overall is good, the acting is especially strong, no overacting, but misses the feeling of portraying depression on screen and instead of goes for hopelessness/desperation. Here the director is to blame not the actors. The director did not really understood what made the book popular in the first place with the target audience.
The music is somewhat lacking and does not really help the emotional aspects of a scene, instead it was selected to give viewers a note of "be aware clue to the WhySheDidIt is coming", even if it's not happening.
Ultimately the show cannot overcome the weaknesses of the actually story as it stays too close to the source, minus the graphic sex and missing the mark on the overall depressive aspect. It's a truthful adaption for TV and therefore exposes the problems that are innate to the source material.
If you never watched much European crime stories, which usually deal more with the psychological aspects of victim and perpetrator - sometime blur the lines - then you might find this very appealing. The show clearly targets a North American audience as such story telling is especially rare in US produced show.
Still if you were never exposed much to to European crime stories, you might find this fresh and intriguing. But be aware this show is so slow that you can walk away for ten minutes and not missed anything. Overall the show doesn't require you to pay much attention anyway.
In the end give the show 6 out of 10 for very good acting, especially on Biel's part. But in the end the story has not enough to offer for the total run time of this limited series, a two part TV movie would have been a way better choice. If you do not like slow burners stay away from this one.