A very strong series during its initial run and in the occasional burst of reruns that can be found occasionally.
Edward Woodward is a superb actor, and was a sharp contrast to most other private detectives of the day (and indeed, even today). The 80's might as well have been called the "Era of the P.I." with so many series centered around them (Magnum P.I., Simon and Simon, Riptide, even Miami Vice and the other police shows). But Robert McCall was an entirely different kind of detective. He was a seemingly mild mannered Englishman, who dressed sharply and drove a cool Jaguar. He rarely engaged in any kind of physical struggles, yet was probably the most menacing of any television P.I. While the others were jumping onto the hoods of cars and duking it out with the bad guys, McCall's quiet presence and absolute lack of any fear whatsoever was thrilling. The fact that a middle aged man who looks more like a University professor than a detective could look so menacing and literally HARDCORE speaks volumes about Woodward's acting capability.
Probably the best theme music ever written, as well.