So this kind of worked for me. MAJOR SPOILERS.
The plotting and the writing overall sucked, I grant you that. Some of the dialog was, to put it euphemistically, awkward.
Verdon's nutso son John Lee was able to convince all the women he killed to give up other women so that he could kill them, too? I don't think so. The whole Rebecca was missing and not reported for three months stretched credulity and that is just an example that comes to mind. There were several of those WTF? moments.
Not to mention for me personally Liotta did not work as a hunka hunka burning love.
Here is what did work:
1) The son's weird motivation for killing these women. I bought it. John Lee was never to have been born. He knew it. That has to give Lee some mixed emotions about his parents, at best, and about other women his dad slept with.
Lee wanted to say "Here I am, Dad. Acknowledge me!" That made a lot of sense to me.
2) The acting was serviceable. I didn't think much of Slater's turn but I did appreciate Fraga and Schultz. Fraga brought sympathy and humanity to what could have been a cipher or a throwaway character. Schultz did a good job of a woman falling into a trap despite her better judgment.
3) The complex end. Has it really been done to death? While I do remember plots of evil, long-lost children; I don't remember this twist-the-knife ending. Verdon's feelings for his son with Ana were forever colored/tainted by the son he had wanted aborted. John Lee wanted to be remembered by his father and Lee insured he would be. That was quite nice. Did Verdon regret his earlier choice to have his first child aborted or did he wish Rebecca had gone through with it, given the result?
4) The music. The very dissonance of the lush, smoothly romantic music in a two-bit thriller caused me to pay attention to it and to the plot points the score wanted to emphasize. Well done. Not sure this was a purposeful decision of the director though.
On the balance the above overcame the many weaknesses of the movie. YMMV.
---with only minutes to react we've somehow been killed by a stick insect -- Londinieres