I've never gotten around to seeing Les Liaisons Dangereuses (1959) so it proves irrelevant, but Dangerous Liaisons is my second favorite of the batch, only falling short of the teen rendering Cruel Intentions (1999). Valmont is lacks in originality being that it was released not even a year following Liaisons.
Glenn Close is deliciously diabolical as the Marquise de Mertueil, one of my favorite characters in American film. Close played this character out well and the scene where she wiped her lipstick off her face as a single tear rolled down her chalk-white face was both emotional and powerful.
John Malkovitch was rather scary as Vicomte de Valmont (one advantage Valmont had over Liaisons was that Colin Firth wasn't as frightening and was a more believable clean-cut man) but I appreciated his performence. All in all, he could have done more with this role.
Michelle Pfeiffer, playing the virginal Madame de Tourvell could have done much more with the situation she was put in. To Me her acting seemed all most bland and fake-pushing cheesy, but the other cast members pretty much saved her due to their extraordinary acting.
Uma Thurman as the terribly naïve Cecile Volanges struck me odd at first, but I gradually became comfortable with her as she took her trip along the sexual escapades.
Christopher Hampton, who also wrote the stage play, did a wickedly good job of adapting the classic novel of sexual intrigue and diabolical endeavors. *****/5