This was a quality "who done it" the first five years with elements of sexual innuendo that kept the viewers interested. "Sex sells" and "too much doesn't" was a good mix that made this show a winner, but the last four seasons brought changes that switched the attention onto the private lives of the detectives instead of the investigation of the high class murders. IMO, viewership got tired of the unprofessionalism of the detectives and lack of creativity of the series.
Review of Silk Stalkings
