It's been a few years, and I certainly can't match you zeal for Emile, I did, for the most part, enjoy The Kill. The period piece (Paris, 1850's), is typical Zola. Intriguing, but somewhat overdone.... rather like a souffle cooked to the point of falling. His studied description of the principal character Aristide paints a picture of a self-absorbed individual with but a singular goal in life... money, regardless of the cost.
Several chapters and parts of chapters (especially the steamy scenes of the denouement of Aristide's second wife Renee', by Aristide's young son, Maxime, or vice-versa depending on ones view) are riveting, only to interspersed with lengthy descriptions of scenery!...
The characters are intentionally shallow, as they surely are. Zola does an excellent job of drawing the reader into the Parisian culture of the times. Of course, being written in 1871 causes one to slowly digest some of the stilted (by today's standards) language and dialogue (Loved Renee's description of Maxime's fiancee', Louise "...Misshapen, ugly, and adorable, she was doomed to die young...").
Although well written, I found the ending with the descent and destruction of Renee' actually painfull, regardless of the eroticism inserted by Zola...