Season 3 was the 2nd best season (after season 2), the plusses being the continued chemistry of Estes and Kapture, some cute medical examiners, and the introduction of the comic Captain Lipschitz, well played by Charlie Brill. The show continued with the somewhat lighter tone introduced in season 2, but does have several rather serious episodes, which, while not high drama, work due to the leads' efforts. The flaws of the season would be signs of the beginning of the end; John Byner, who played a likeable hustler who had a love/hate relationship with our heroes, left suddenly midseason and we're introduced to his brother "Atticus", not as well-played and a somewhat sleazier character (I suspect these scripts were written for Byner, and he declined, as Atticus acts more like a pervert than a good-natured con-artist).
Also, as this was the 1st season the show was cable-only, it does appear to have slightly cheaper production values (as if that was possible) than seasons 1 & 2, although that was always part of the show's charm; it had no right to really work, and yet it does.
So if you like charismatic leads, over-the-top plots, and Cinemax-after-dark love scenes w/o nudity (featuring Carrie-Ann Moss and Robert Forster, among others, during the season), then Silk Stalkings seasons 1-3 are for you. Season 4 was a lot more "serious," with lame love relationships for the cops, and might be for die-hards only. But seasons 2 & 3, especially, are a lot of fun.