While a well-done show without the cheesiness of so many "reenactment" approaches to the topic of real crime, the limited scope of the show becomes repetitive.
Impressed with the live interviews of many of the people involved in the cases - from Law Enforcement to family, crime scene analysts, forensic behavioral therapists and even perpetrators of these tragic crimes - definitely the show's strength.
Focus on "the perfect life" to "kill the husband" as the primary plot for seasons of a show like this have drained it of any surprise after only a few episodes, hence my 7.
A good show for real crime buffs who prefer less reenactment and more reality. My recommendation: watch it over time to keep your perspective fresh.