I´m usually not a fan of the "so bad it´s good" category but I feel like this movie really fits in there. Most of the characters are so stupid and the conversations so silly (nothing new for a lifetime movie at that, but it actually works to this films advantage) that it really turns into a comedy (in a good way). The villainess is very over the top, she´s like a psycho toddler on drugs, it makes no sense that Brent wouldn´t just kill her and enjoy the money with his sexy young wife. Neither does it make sense that he would have gotten her to believe he was for real, but... anyway. He tries his best to complete the mission, but his real girlfriend constantly shows up and tries to ruin it, often in very cartoon-ish ways, even though this was her plan that she supposedly spent months planning.
Review of Fiancé Killer
