A fine example of both the strengths and the pitfalls of the anthology series, Police Story was among the highest-rated series of its time. At its worst, the series was as formulaic as most of commercial TV. At its best, it blew a breath of fresh air through mid-70's TV.
Created as a vehicle for writer-turned-producer (and former L.A. cop) Joseph Wambaugh, the best episodes grittily portrayed the life of the street cop--good and bad. Each episode opened and closed with crackling radio calls (Female dispatcher: "John Frank William, 8-9-9). Guest stars ranged from Don Meredith (at the height of his Monday Night Football popularity) to David Birney (as amputee cop "Captain Hook") to a surprising turn by ultra-liberal Ed Asner (as an grinning old cop threatening to blow away one last perp before retiring in "Three Days to Thirty"). The series spawned the silly spin-off "Police Woman"; but it also dealt with cops who thought of their badge as a license to bully ("The Wyatt Earp Syndrome"--so titled because the Standards and Practices department refused to allow Wambaugh to call this episode by its original title--"The John Wayne Syndrome") and undercover cops who were difficult to distinguish from the criminals they pursued ("The Player" with James Farentino).
Wambaugh reportedly tired of the regular infighting such a weekly series required, and semi-retired to a "consultant" status mid-way through the series run; the early episodes are clearly the best. But all are worth watching if only as the precursor which made later shows like St. Elsewhere, L.A. Law, and Homicide possible.