First of all, it's not really an adaptation. If you read carefully even here on IMDB, you will find out that Harriet Warner, who have written the first episode, was merely inspired by the original story. So it's more like a story based on the characters rather than adaptation of the classics, which could be enough for some people to skip it. The story in the series is so different that it actually puzzled me at first: what am I even watching? Character names are known, there seems to be the same period as in the novel, but that's where resemblance ends and it is in a bad way.
Don't be fooled, that's just another attempt to make money on the story with fancy name with the hope that viewer had never read it. Because if you did, there's no other answer to the omnipresent question: why diverting so much from the original novel while keeping character names and the name of the story?
Picture is good and there seems to be an intrigue, but once again, this is not original de Laclos writing and competing with him while keeping the name of his novel seems insulting.
I have only seen the first episode of the show and will not continue with it. If you have never read the story, better read it or watch one of the many successful films: Dangerous Liaisons (1988), Cruel Intentions (1999) or more dated French version from 1960.